Blender Git Loki

Avoid adding overlapping triangles in convex hull

Add an epsilon value to the point-outside-hull test, helps when some
of the input vertices are nearly coplanar.

Fixes bug [#31941] convex hull fails (and depends on vertex order when it shouldn't)
http://projects.blender.org/tracker/index.php?func=detail&aid=31941&group_id=9&atid=498