Version 2.

"Change Set:  PNGReadWriter
Date:   10 February 2004
Author:   Andreas Raab

Provide PNGReadWriter with the ability to write files. In addition, fix some
issues with transparency in PNGs which was not handled correctly.

v2: Vastly improved version. Includes a test suite which ensures that we can
use PNG consistently to save and load Squeak forms.

"
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