grafx - Extensible Java Graphics Package Code

Removing DEBUG sections because that makes the code too difficult to read for
purposes of carrying this work over to 3D graphics rendering. Also improving a
Javadoc for setClip().

Adding one more test case. It passes.

Adding final DEBUG statement. The code now works.

This ought to get at least very close to fixing the clipping issues.

Oh my, just found another bug related to clipping.

Defining DEBUG_SET_CLIP so that the debug code could stay in for a while.

Spiffying up class FloatColor.

Offering a much more rigorous definition of ClipRectangle. Now we can actually
start using it.

TODO, need to implement intersection().

I think I'm going to avoid this complex boolean logic. My brain just isn't
able to really handle it. I prefer the simpler approach.