grafx - Extensible Java Graphics Package Code

Working on drawPoint() and writing down a very important comment, which has to
do with budging the z planes for line and polygon clipping.

Using zNormalized parameter in private drawPoint().

Paving way for having second, private drawPoint() for internal use.

Changing some comments.

Defining STRATEGY_CORRECTNESS and STRATEGY_PERFORMANCE.

Making some progress on drawPoint(). There are still some loose ends to tie
up: degenerate line drawing cases and a close examination of drawPoint().

m_normalizedFront is now a double, not a float.

Adding a TODO comment in computeIntColorNormz(). Potential performance issue.

Removing m_ccfoff and making necessary adjustments.

Removing m_zeroScanline, adjusting clear().