Added information in the documentation about problems with and fixes for
the bad CRC and bad iTXt chunk situations.

which requires both the correct libpng and the correct zlib to function
correctly.

Fixed whitespace handling
Added a call to png_set_packing()
Initialize dimension values so if sscanf fails at least we have known
   invalid values.

    only works with libpng versions that can be made to reliably fail when
    the deflate data contains an out-of-window reference.  This means only
    1.6 and later.
  Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
    message which it is easier to work round than ignore.

For inflate, reverted previous fixes.
Added fixitxt and pngdeflate to the built programs and removed warnings
from the source code and timepng that are revealed as a result.  Fixed
fixitxt when the chunk length is more than 65535 (untested, no test case).

Ignore "#" delimited comments in input file to pnm2png.c.

trusting the CMF bytes in the PNG datastream.

png_create_write_struct() (Andrew Church).

handling in libpng.1.5.x and with bugs in libpng-1.4.x and earlier.

about the need to call png_set_keep_unknown_chunks() when writing them.

Rebuilt the configure scripts.

'off'.  Previously the ARM NEON specific files were still built if the option
was switched 'off' as opposed to being explicitly disabled.

switched 'off'.  Previously the ARM NEON specific files were still built
if the option was switched 'off' as opposed to being explicitly disabled.