in pngvalid.c

objective of simplifying and improving the cosmetic appearance of png.h.

with the objective of improving the cosmetic appearance of png.h.

  Added some commentary about PNG_EXPORT in png.h and pngconf.h

which returned the wrong type (png_uint_32 instead of png_uint_16).

Moved reading of file signature into png_read_sig (Cosmin)
Fixed atomicity of chunk header serialization (Cosmin)
Added test for io_state in pngtest.c (Cosmin)
Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts.

to catch library and header mismatch, also found at the end of pngtest.c.

that CCP writes to standard output by default (Martin Banky).

Studio 2010 (John Bowler).

and shortening problems on assignment but also a few difficult to optimize
(for GCC) loops (John Bowler).