Further progress with integrating Professor Tao Ju's dual contouring contribution into Blender.

The video shows various modes and features; in particular note that sharp edges are working now.

At this point the code is only integrated as a mesh modifier, but I'll be looking into the metaball code to see if it can be better integrated there as well. There are also a few features left to enable, as well as some unfinished areas such as better handling for polygons that aren't quads or triangles.

A patch against trunk is available here:

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