./png.py -T pngsuite images are now output in "direct" format.  Not always RGB8.
./png.py -T pngsuite images are now output in "direct" format.  Not
always RGB8.


git-svn-id: 319eb561774c901116a2c19d0db24e717df3a3eb@47 40d66c6c-0ee5-11de-8837-45bce846067a

drj11/pypng,Scondo/purepng,mnaberez/pypng,drj11/pypng,Scondo/purepng,mnaberez/pypng