pngtodo.txt - list of things to do for libpng

for 0.9
   medium memory model
   improved dithering?

for 1.1
	push reader

for 1.1 or later
   overlaying one image on top of another
	optional palette creation
	histogram creation
	text conversion between different code types
   cHRM transformation
   support for other chunks being defined (sCAl, the gIF series,
      and others that people come up with).
   pull writer
   better dithering
   keep up with public chunks
   other compression libraries
   more exotic interlace handling
   better filtering (counting huffman bits?  filter type inertia?)
   C++ wrapper
   other languages (pascal, for one)
   comments of > 64K