Blender Git Loki

Fixed bug for some binary boolean ops. Fixed a memory leak.

Now the basic binary booleans work from the tool (not the modifier).
Still to do: (1) coplanar and non-connected-component cases;
(2) dissolve triangulation lines and new verts due only to them;
(3) properly transfer mesh attributes from old to new;
(4) hook up to modifier;
(5) attention to and tuning of performance.