grafx - Extensible Java Graphics Package Code

This is pretty amazing. I was able to clear the hard level without any
problems, by following the instructions from the eval() function, which only
saw the current block (not next block). I think it performs better than I do.

Doing better null handling of transform in putUniqueOrientedBlock().

Remove some dead code etc.

Modify generate-blocks-sources.

Work on the even rotations.

Commenting out the reductions that aren't necessary.

This seems to be a complete set of reductions.

Adding some more negation simplifications.

Adding a few more missing reductions.

Still looking for missing reductions.