grafx - Extensible Java Graphics Package Code

Adding some more negation simplifications.

Adding a few more missing reductions.

Still looking for missing reductions.

Adding some missing reductions.

Still working on the rotation reductions.

Adding some more missing transforms.

Filling some missing reductions. Not done yet I think.

I think I fixed a bug. I don't know how correct this is. Still testing. This
code is so complex that it seems to make my head turn upside down; I wonder
about the secrets of the Universe as I work on this code. It's so awe-
inspiring that I think I have to make a video explaining it.

Encountered a bit of a bug; working on it. Try to reduce "-xy-y".

Making a little bit of progress on simplifyCompositeRotation().