diff --git a/GRRLIB/lib/png/png.c b/GRRLIB/lib/png/png.c
index cba18ba..aecfd5c 100644
--- a/GRRLIB/lib/png/png.c
+++ b/GRRLIB/lib/png/png.c
@@ -1,7 +1,7 @@
 
 /* png.c - location for general purpose libpng functions
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -14,7 +14,7 @@
 #include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_10 Your_png_h_is_not_version_1_5_10;
+typedef png_libpng_version_1_5_11 Your_png_h_is_not_version_1_5_11;
 
 /* Tells libpng that we have already handled the first "num_bytes" bytes
  * of the PNG file signature.  If the PNG data is embedded into another
@@ -655,14 +655,14 @@ png_get_copyright(png_const_structp png_ptr)
 #else
 #  ifdef __STDC__
    return PNG_STRING_NEWLINE \
-     "libpng version 1.5.10 - March 29, 2012" PNG_STRING_NEWLINE \
-     "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
+     "libpng version 1.5.11 - June 14, 2012" PNG_STRING_NEWLINE \
+     "Copyright (c) 1998-2012 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
      "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
      "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
      PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.5.10 - March 29, 2012\
-      Copyright (c) 1998-2011 Glenn Randers-Pehrson\
+      return "libpng version 1.5.11 - June 14, 2012\
+      Copyright (c) 1998-2012 Glenn Randers-Pehrson\
       Copyright (c) 1996-1997 Andreas Dilger\
       Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
 #  endif
@@ -969,8 +969,8 @@ int png_XYZ_from_xy(png_XYZ *XYZ, png_xy xy)
     * and it is certain that it becomes unstable where the end points are close
     * together.
     *
-    * So this code uses the perhaps slighly less optimal but more understandable
-    * and totally obvious approach of calculating color-scale.
+    * So this code uses the perhaps slightly less optimal but more
+    * understandable and totally obvious approach of calculating color-scale.
     *
     * This algorithm depends on the precision in white-scale and that is
     * (1/white-y), so we can immediately see that as white-y approaches 0 the
@@ -2044,7 +2044,7 @@ png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times,
 }
 #endif
 
-#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gammma */
+#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gamma */
 /* Calculate a reciprocal, return 0 on div-by-zero or overflow. */
 png_fixed_point
 png_reciprocal(png_fixed_point a)
diff --git a/GRRLIB/lib/png/png.h b/GRRLIB/lib/png/png.h
index 4e0dee1..b1c9e72 100644
--- a/GRRLIB/lib/png/png.h
+++ b/GRRLIB/lib/png/png.h
@@ -1,7 +1,7 @@
 
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.5.10 - March 29, 2012
+ * libpng version 1.5.11 - June 14, 2012
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
  * Authors and maintainers:
  *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.5.10 - March 29, 2012: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.11 - June 14, 2012: Glenn
  *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -174,6 +174,9 @@
  *    1.5.9                   15    10509  15.so.15.9[.0]
  *    1.5.10beta01-05         15    10510  15.so.15.10[.0]
  *    1.5.10                  15    10510  15.so.15.10[.0]
+ *    1.5.11beta01            15    10511  15.so.15.11[.0]
+ *    1.5.11rc01-05           15    10511  15.so.15.11[.0]
+ *    1.5.11                  15    10511  15.so.15.11[.0]
  *
  *   Henceforth the source version will match the shared-library major
  *   and minor numbers; the shared-library major version number will be
@@ -205,7 +208,7 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.10, March 29, 2012, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.11, June 14, 2012, are
  * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
@@ -317,13 +320,13 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    March 29, 2012
+ *    June 14, 2012
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.5.10 are Y2K compliant.  It is my belief that
+ *    upward through 1.5.11 are Y2K compliant.  It is my belief that
  *    earlier versions were also Y2K compliant.
  *
  *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -334,7 +337,8 @@
  *        "png_uint_16 year" in png_time_struct.
  *
  *    The string is
- *        "png_char time_buffer" in png_struct
+ *        "char time_buffer[29]" in png_struct.  This will be no
+ *    longer used in libpng-1.6.0 and will be removed from libpng-1.7.0.
  *
  *    There are seven time-related functions:
  *        png.c: png_convert_to_rfc_1123() in png.c
@@ -381,9 +385,9 @@
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.5.10"
+#define PNG_LIBPNG_VER_STRING "1.5.11"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.10 - March 29, 2012\n"
+     " libpng version 1.5.11 - June 14, 2012\n"
 
 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -391,7 +395,7 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   5
-#define PNG_LIBPNG_VER_RELEASE 10
+#define PNG_LIBPNG_VER_RELEASE 11
 
 /* This should match the numeric part of the final component of
  * PNG_LIBPNG_VER_STRING, omitting any leading zero:
@@ -422,7 +426,7 @@
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
  */
-#define PNG_LIBPNG_VER 10510 /* 1.5.10 */
+#define PNG_LIBPNG_VER 10511 /* 1.5.11 */
 
 /* Library configuration: these options cannot be changed after
  * the library has been built.
@@ -544,7 +548,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
  * do not agree upon the version number.
  */
-typedef char* png_libpng_version_1_5_10;
+typedef char* png_libpng_version_1_5_11;
 
 /* Three color definitions.  The order of the red, green, and blue, (and the
  * exact size) is not important, although the size of the fields need to
diff --git a/GRRLIB/lib/png/pngconf.h b/GRRLIB/lib/png/pngconf.h
index bbb547f..314fcc6 100644
--- a/GRRLIB/lib/png/pngconf.h
+++ b/GRRLIB/lib/png/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.5.10 - March 29, 2012
+ * libpng version 1.5.11 - June 14, 2012
  *
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -25,7 +25,7 @@
 #ifndef PNG_BUILDING_SYMBOL_TABLE
 /* PNG_NO_LIMITS_H may be used to turn off the use of the standard C
  * definition file for  machine specific limits, this may impact the
- * correctness of the definitons below (see uses of INT_MAX).
+ * correctness of the definitions below (see uses of INT_MAX).
  */
 #  ifndef PNG_NO_LIMITS_H
 #    include <limits.h>
diff --git a/GRRLIB/lib/png/pngerror.c b/GRRLIB/lib/png/pngerror.c
index 95002f8..e0585a8 100644
--- a/GRRLIB/lib/png/pngerror.c
+++ b/GRRLIB/lib/png/pngerror.c
@@ -2,7 +2,7 @@
 /* pngerror.c - stub functions for i/o and memory allocation
  *
  * Last changed in libpng 1.5.8 [February 1, 2011]
- * Copyright (c) 1998-2012 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
diff --git a/GRRLIB/lib/png/pngpread.c b/GRRLIB/lib/png/pngpread.c
index 8a5aa29..6b65ba8 100644
--- a/GRRLIB/lib/png/pngpread.c
+++ b/GRRLIB/lib/png/pngpread.c
@@ -1,7 +1,7 @@
 
 /* pngpread.c - read a png file in push mode
  *
- * Last changed in libpng 1.5.9 [February 18, 2012]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -282,8 +282,8 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
             png_error(png_ptr, "Missing PLTE before IDAT");
       }
    }
-
 #endif
+
    else if (chunk_name == png_PLTE)
    {
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -550,6 +550,7 @@ png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
    }
 
 #endif
+
    else
    {
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
diff --git a/GRRLIB/lib/png/pngpriv.h b/GRRLIB/lib/png/pngpriv.h
index e76a579..9b69f8c 100644
--- a/GRRLIB/lib/png/pngpriv.h
+++ b/GRRLIB/lib/png/pngpriv.h
@@ -1259,10 +1259,8 @@ PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
     png_uint_32 length));
 #endif
 
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
     png_infop info_ptr, png_uint_32 length));
-#endif
 
 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
     png_uint_32 chunk_name));
diff --git a/GRRLIB/lib/png/pngrtran.c b/GRRLIB/lib/png/pngrtran.c
index 5561852..96732b5 100644
--- a/GRRLIB/lib/png/pngrtran.c
+++ b/GRRLIB/lib/png/pngrtran.c
@@ -1,7 +1,7 @@
 
 /* pngrtran.c - transforms the data in a row for PNG readers
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1770,8 +1770,8 @@ png_init_read_transformations(png_structp png_ptr)
          int num_palette = png_ptr->num_palette;
          int i;
 
-         /*NOTE: there are other transformations that should probably be in here
-          * too.
+         /* NOTE: there are other transformations that should probably be in
+          * here too.
           */
          for (i = 0; i < num_palette; i++)
          {
@@ -2277,7 +2277,7 @@ png_do_read_transformations(png_structp png_ptr, png_row_infop row_info)
 #endif
 
 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
-   /*NOTE: moved here in 1.5.4 (from much later in this list.) */
+   /* NOTE: moved here in 1.5.4 (from much later in this list.) */
    if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
        (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
       png_do_gray_to_rgb(row_info, png_ptr->row_buf + 1);
@@ -2301,7 +2301,8 @@ png_do_read_transformations(png_structp png_ptr, png_row_infop row_info)
 
 #ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
    /* Added at libpng-1.5.10 */
-   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE)
+   if (row_info->color_type == PNG_COLOR_TYPE_PALETTE &&
+       png_ptr->num_palette_max >= 0)
       png_do_check_palette_indexes(png_ptr, row_info);
 #endif
 
@@ -3302,7 +3303,7 @@ png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
                if (red != green || red != blue)
                {
                   rgb_error |= 1;
-                  /*NOTE: this is the historical approach which simply
+                  /* NOTE: this is the historical approach which simply
                    * truncates the results.
                    */
                   *(dp++) = (png_byte)((rc*red + gc*green + bc*blue)>>15);
diff --git a/GRRLIB/lib/png/pngset.c b/GRRLIB/lib/png/pngset.c
index e0118fa..8c07eec 100644
--- a/GRRLIB/lib/png/pngset.c
+++ b/GRRLIB/lib/png/pngset.c
@@ -1,7 +1,7 @@
 
 /* pngset.c - storage of image information into info struct
  *
- * Last changed in libpng 1.5.10 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -149,7 +149,7 @@ png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
     * possible for 1/gamma to overflow the limit of 21474 and this means the
     * gamma value must be at least 5/100000 and hence at most 20000.0.  For
     * safety the limits here are a little narrower.  The values are 0.00016 to
-    * 6250.0, which are truly ridiculous gammma values (and will produce
+    * 6250.0, which are truly ridiculous gamma values (and will produce
     * displays that are all black or all white.)
     */
    if (file_gamma < 16 || file_gamma > 625000000)
@@ -1291,8 +1291,10 @@ png_set_benign_errors(png_structp png_ptr, int allowed)
 }
 #endif /* PNG_BENIGN_ERRORS_SUPPORTED */
 
-#ifdef PNG_READ_CHECK_FOR_INVALID_INDEX_SUPPORTED
-   /* Do not report invalid palette index; added at libng-1.5.10 */
+#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
+/* Whether to report invalid palette index; added at libng-1.5.10
+ *   allowed  - one of 0: disable; 1: enable
+ */
 void PNGAPI
 png_set_check_for_invalid_index(png_structp png_ptr, int allowed)
 {
diff --git a/GRRLIB/lib/png/pngstruct.h b/GRRLIB/lib/png/pngstruct.h
index 43a45cd..db0d4e4 100644
--- a/GRRLIB/lib/png/pngstruct.h
+++ b/GRRLIB/lib/png/pngstruct.h
@@ -1,11 +1,11 @@
 
 /* pngstruct.h - header file for PNG reference library
  *
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
- * Last changed in libpng 1.5.9 [March 29, 2012]
+ * Last changed in libpng 1.5.9 [February 18, 2012]
  *
  * This code is released under the libpng license.
  * For conditions of distribution and use, see the disclaimer
@@ -248,6 +248,7 @@ struct png_struct_def
 #endif
 
 #ifdef PNG_TIME_RFC1123_SUPPORTED
+   /* This is going to be unused in libpng16 and removed from libpng17 */
    char time_buffer[29]; /* String to hold RFC 1123 time text */
 #endif
 
diff --git a/GRRLIB/lib/png/pngtrans.c b/GRRLIB/lib/png/pngtrans.c
index fef12f1..ee60957 100644
--- a/GRRLIB/lib/png/pngtrans.c
+++ b/GRRLIB/lib/png/pngtrans.c
@@ -1,7 +1,7 @@
 
 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -626,7 +626,7 @@ void /* PRIVATE */
 png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info)
 {
    if (png_ptr->num_palette < (1 << row_info->bit_depth) &&
-      png_ptr->num_palette_max >= 0)
+      png_ptr->num_palette > 0) /* num_palette can be 0 in MNG files */
    {
       /* Calculations moved outside switch in an attempt to stop different
        * compiler warnings.  'padding' is in *bits* within the last byte, it is
@@ -708,7 +708,7 @@ png_do_check_palette_indexes(png_structp png_ptr, png_row_infop row_info)
          {
             for (; rp > png_ptr->row_buf; rp--)
             {
-               if (*rp >= png_ptr->num_palette_max)
+               if (*rp > png_ptr->num_palette_max)
                   png_ptr->num_palette_max = (int) *rp;
             }
 
diff --git a/GRRLIB/lib/png/pngwrite.c b/GRRLIB/lib/png/pngwrite.c
index b587f1b..2a72ad3 100644
--- a/GRRLIB/lib/png/pngwrite.c
+++ b/GRRLIB/lib/png/pngwrite.c
@@ -1,7 +1,7 @@
 
 /* pngwrite.c - general routines to write a PNG file
  *
- * Last changed in libpng 1.5.10 [March 8, 2012]
+ * Last changed in libpng 1.5.11 [June 14, 2012]
  * Copyright (c) 1998-2012 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -806,7 +806,8 @@ png_write_row(png_structp png_ptr, png_const_bytep row)
 /* Added at libpng-1.5.10 */
 #ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
    /* Check for out-of-range palette index */
-   if(row_info.color_type == PNG_COLOR_TYPE_PALETTE)
+   if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
+       png_ptr->num_palette_max >= 0)
       png_do_check_palette_indexes(png_ptr, &row_info);
 #endif
 
diff --git a/grrlib.doxygen b/grrlib.doxygen
index 8bb0737..46e8930 100644
--- a/grrlib.doxygen
+++ b/grrlib.doxygen
@@ -1,4 +1,4 @@
-# Doxyfile 1.8.1
+# Doxyfile 1.8.1.1
 
 # This file describes the settings to be used by the documentation system
 # doxygen (www.doxygen.org) for a project
@@ -588,7 +588,7 @@ FILE_VERSION_FILTER    =
 
 # The LAYOUT_FILE tag can be used to specify a layout file which will be parsed 
 # by doxygen. The layout file controls the global structure of the generated 
-# output files in an output format independent way. The create the layout file 
+# output files in an output format independent way. To create the layout file 
 # that represents doxygen's defaults, run doxygen with the -l option. 
 # You can optionally specify a file name after the option, if omitted 
 # DoxygenLayout.xml will be used as the name of the layout file.
@@ -801,7 +801,7 @@ INLINE_SOURCES         = NO
 
 # Setting the STRIP_CODE_COMMENTS tag to YES (the default) will instruct 
 # doxygen to hide any special comment blocks from generated source code 
-# fragments. Normal C and C++ comments will always remain visible.
+# fragments. Normal C, C++ and Fortran comments will always remain visible.
 
 STRIP_CODE_COMMENTS    = YES
 
@@ -952,9 +952,7 @@ HTML_TIMESTAMP         = NO
 
 # If the HTML_DYNAMIC_SECTIONS tag is set to YES then the generated HTML 
 # documentation will contain sections that can be hidden and shown after the 
-# page has loaded. For this to work a browser that supports 
-# JavaScript and DHTML is required (for instance Mozilla 1.0+, Firefox 
-# Netscape 6.0+, Internet explorer 5.0+, Konqueror, or Safari).
+# page has loaded.
 
 HTML_DYNAMIC_SECTIONS  = NO