grafx - Extensible Java Graphics Package Code

Fixing the bug in drawPoint(), which was related to normals and ununiform
scale.

Making xCoord and yCoord 'final' in drawPoint() in RasterDepthGraphics.

Adding a bit of temporary error checking code which makes sure that the facet
normals are correct.

First pass at revisiting the drawing of polygon vertices. Not tested, but
compiles.

Making getPointAlias() a static function, because it's algorithm-related, and
not state-related.

Making a preliminary implementation of VectorUtils.sliverContainsSamplePoint().
Had to make some necessary changes to VectorUtils, to the new functions there.

Dropping the EPSILON back face culling from drawPoint(). Adding function
dotProductXY() to VectorUtils.

Fixing a spelling error in Javadoc and adding a signature to
sliverContainsSamplePoint() in Donut.

Adding a stub for sliverContainsSamplePoint() in Donut. There is a large
comment explaining this, but the signature/implementation have not been done
yet.

Adding a comment explaining the barebones method of computing facet normal,
with a reference to Newell's algorithm.