grafx - Extensible Java Graphics Package Code

Removing RasterDepthPixBuff.getAccurateZ(). Build still broken.

Starting to make major RasterDepthPixBuff API changes. Mostly Javadoc changes
but the drawPixel() method has changed, zDepth is no longer an integer; now
it's a 64 bit floating point number. This totally breaks the build for the
time being.

Only Javadoc changes to RasterDepthGraphics.

Renaming PDF files.

Renaming opencsg.pdf to Kirsch-2005.pdf, adding two more.

Adding an OpenCSG doc.

Adding more research papers related to CSG and z buffering.

Starting to add some PDF research papers related to CSG and z buffering.

Post-release, moving Javadoc changes back to 'blockout' project.

Fixing some last-minute Javadoc issues.