grafx - Extensible Java Graphics Package Code

Fixing spelling error in comment.

Comment and Javadoc improvements.

Moving the zFront/zBack definitions into RasterDepthPixBuff.

Filling out the Javadoc in RasterDepthPixBuff.

Adding two new test cases, EqualIntervals and MultPow2.

Things are looking superb with the 3D graphics library. I need some rest.

More work on the z space. Two options now.

Adding a large comment above alias() with results of findings on loss of
resolution for large values.

Well the findings of AliasLossOfResolution are very interesting and extremely
useful.

Adding AliasLossOfResolution with a long comment. This logic is so difficult
to handle, but I'm plugging along.