grafx - Extensible Java Graphics Package Code

No longer requiring that zFront >= zBack.

Adding one more thing under MAJOR TODO.

Donut restored. Getting about 1ms frame renders.

Adding ZBITS_28.

Initial pass at trying to compute quick 'n' dirty z values.

Cutting out the commented out experimental setPix() code. That experimental
code has been put into Donut, when it uses PIXBUFF_ABSTRACTION.

Adding a bunch of commented-out code to RasterDepthGraphics, which details some
alternative methods of handling setPix(). The code that was being used is
unchanged.

Getting PIXBUFF_ABSTRACTION to work.

In Donut, getting the ball rolling for PIXBUFF_ABSTRACTION.

Adding VIEWPORT_CLIPPING to Donut 3D demo.