grafx - Extensible Java Graphics Package Code

Adding random test cases to NormalizeZ, found no errors.

Refining some comments in RasterDepthGraphics.

Adding class NormalizeZ which is some test code.

Adding a main() method to net.blockout.production.Blocks which prints out how
many of each cardinality there are. For example there are 29 5-er blocks.

Carrying over the recent changes to edges & clipper to Gouraud shading tech.

Saving changes because I'm likely going to back everything out.

Pure comment changes. I want to save these comments, because as I'm writing
them I realized that we should do polygon clipping in a pre z normalized state.

Going over more of the 3D rendering code with a fine-toothed comb.

Making some minor revisions to 3D graphics, esp. as related to line drawing.
Mostly just declaring variables as 'final' where it can be done. Optimizing at
least one loop as well.

Adding long comment explaining choice of extents for m_fillPolyClip.