grafx - Extensible Java Graphics Package Code

Implementing BlockGenerator.getCanonicalBlock() in terms of
getCanonicalBlock2(). Finally generating the new
net.blockout.production.Blocks.

Now grouping the canonicals by reflexive pair, where asymmetric.

Working on getBlocks(). Still missing the grouping by mirror pairs.

New API for getCanonicalBlock2(), which now returns an array of length two,
where each entry in array, if not null, is a canonical representation. This is
likely the hardest problem I've ever worked on, with the symmetries,
recursions, etc.

Changing some variable names. Really an innocent change.

Simplifying getAll_n_Blocks(int).

Starting to improve the correctness in getAll_n_Blocks(int), both in Javadoc
and in the code. Efficiency will be improved as a side effect. Right now the
overall build will be broken for a while.

Slight change in Javadoc comment.

Adding new getCanonicalBlock(), with a different name for now. Not being used
yet. I need to rest a little because this is very complex.

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].