[FIX] PNGFixes-nk ( Fixes for Andreas' PNGReadWriter enhancements )

[ned at squeakland.org]

"Change Set:		PNGFixes-nk
Date:			17 February 2004
Author:			Ned Konz

Some fixes for the PNG reading and writing:
* don't crash Squeak when performing tests (fixed in Zlib writer).
* generate Adler32 checksum in compressed image chunks so other programs
can read Squeak's PNG files.
* verify Adler32 checksum in compressed image chunks to detect
corruption.
* modify test suite so that if you have the PngSuite.zip installed we
also check for detection of corrupted files.

"













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