(adapted from the UNUSED() macro in pngvalid.c by John Bowler)

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.

Also removed two obsolete comments from png.c

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).