grafx - Extensible Java Graphics Package Code

Moving great big comment related to degenerate deltaX and deltaY. Defining
LINE_MINIMUM_DELTA_XY.

Changing the 2 locations of line-drawing code, doing a swap. Constant color
comes first. Unfortunately I mixed in a huge new comment in there.

Introducing poly() and optimizing some of the poly edge objects.

Making a slight optimization in FloatPolyEdge.initialize().

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.