grafx - Extensible Java Graphics Package Code

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.

Class LessThanOneF turned into a performance test.

Adding class AliasIsntCast which reminds us that we're casting from the
interval [1.0,2.0). Casting from values just barely below that will give
different results.