Modifying m_lineClip to use pixelLowerBound() and pixelUpperBound().
Adding LineIntegrityCheck1 and LineIntegrityCheck2.
Adding pixelUpperBound() and pixelLowerBound().
Rearranging location of code snippets.
Did some basic tests of fixed 3D rendering code; it works.
Fixing the degenerate cases in line drawing.
Removing the s_strategy nonsense.
Embellishing the top-level class Javadoc.
Now clipping lines and polygons on the slightly offset z planes.
Defining s_normzCutPlaneBack and s_normzCutPlaneFront. Not used yet.
