grafx - Extensible Java Graphics Package Code

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.

Simplifying drawPoint(), updating comments there, running the fringe cases
through the test again. Adding helpful comments in line-drawing routines.
Swapping the constant color polygon fill with the color-interpolated polygon
fill, putting the constant color up top. Simple code first. Followed the same
strategy with line-drawing code: have already put the single color line-draw
first. Final read-through. Looks good. I want to add some test scenarios
to Donut, then release new versions of grafx and grafx_3d.

Fixing the clear() incorrectness in 3D rendering library.