grafx - Extensible Java Graphics Package Code

Some change of name, findBestBlock() -> findBestBlockOrientation(), which
returns a BlockOrientation objects intead of a Layer[] object. An inner voice
told me to make this change, I don't know the exact reasons for it [yet].

Adding an item to TODO.txt.

Making very slight incremental progress. This is extremely difficult because
it's highly recursive, there is a chicken and egg problem, and there is a great
deal of reflexivity in code, not just in the block itself. It's almost as if
I'm solving some deep issues in the Universe. I think I know what has to be
done. I think findBestBlock() has to be changed to return a BlockOrientation
object next.

Adding additional comment to findBestBlock() explaining that returned array
will be equal by reference to 'orientedBlock' of one of the input list's items.

Renaming getCenterOfMass() to getCenterOfMassDirect() and adding a commen to
that function, explaining the problem at hand.

In BlockGenerator, adding 'originOccupied' leaf-level subordering for
findBestBlock().

Changing location of where lowestDepth is defined and used, in findBestBlock().
This is paving way for additional change which will break things. I want to
separate this change from the one which will break things.

Adding TODO comment above getCenterOfMass(), which further explains the problem
that we are dealing with.

Adding long comment to the top of findBestBlock(), which is private. The
purpose of this commit is to advertise my intention. I will be needing help.

Putting BlockMirrorImageCheck to a somewhat finalized state. We have a lot of
work to do. The idea of "canonical" totally disregarded reflections. We need
to fix that.