grafx - Extensible Java Graphics Package Code

Moving over the most recent changes/improvements from 'blockout' branch to
'grafx' branch, related only to 2D rendering lib and demo support code.

Removing unused function bounded(), which was at one point added to try to
solve getClip(), and making unused method debugInclusiveBoundsPixelClip()
private so that it would not clutter up Javadoc.

Adding AliasPerformance.

Adding Float64DividePerformance and Float64MultiplyPerformance.

Adding the performance test results.

Adding Float32AddPerformance and Float32SubtractPerformance.

Adding Float64AddPerformance and Float64SubtractPerformance.

Adding one more comment.

Adding to Z-NOTES.txt.

Fourth-dim explanation, preliminary.