### Added a lot of comments to 3D Voronoi algorithm, fixed bug in testVoronoi3D....

Added a lot of comments to 3D Voronoi algorithm, fixed bug in testVoronoi3D. Disabled expensive checks. Some basic 3D moving mesh tests now work.

Added a lot of comments to 3D Voronoi algorithm, fixed bug in testVoronoi3D. Disabled expensive checks. Some basic 3D moving mesh tests now work.