Latest changes break gradient scaling

[theturtle32]

After the latest set of changes, removing twips2px etc, gradients are no longer rendered at the correct scale.

See http://www.openpalace.org/gordon-bug/ for screenshots.

[ecurtz]

The removal of twips2px seems to have broken all sorts of stuff. I can't get even the original demo swfs to play correctly in anything built from source after Feb 24.

If I restore twips2px to readRect() and readMatrix() that fixes the May 1 source tree.