grafx - Extensible Java Graphics Package Code

Starting to go over RasterDepthGraphics with a fine-toothed comb. Mostly
Javadoc changes.

Some very minor final Javadoc modifications to RasterFloatGraphics.

Making some final improvements to RasterFloatGraphics. This is looking really
good now.

Adding missing 'd' making it '0.5d'.

Really cleaning up the 2D rendering code. It's perfect. I think.

Finished making changes and testing PixelAndPoly.

Adding a comment, alias() function won't change.

Adding test code 'PixelAndPoly'.

Removing commented out System.out.println() statements.

Introducing GRENZE_EINS_UPPER and GRENZE_EINS_LOWER.