Add test that calls command line, to test PGM reading.
Add test that calls command line, to test PGM reading.


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

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