This is a pretty much complete build with virtual functions, but I'm not that...

This is a pretty much complete build with virtual functions, but I'm not that happy with it. Ideally, I want the compiler to make two separate copies of the routines in voronoicell and voronoicell_neighbor, and then inline all the virtual functions into each copy. But it doesn't seem smart enough to do that, and it's wasting about two percent of time doing vtable lookups for empty functions.

git-svn-id: https://code.lbl.gov/svn/voro/trunk@41 6221c96e-593b-4ce1-a500-64c4038a1943