Blender Git Loki

Fix for subsurf oscillations along creased boundary edges

Changed the "exterior edge interior shift" section of subsurf calc to
always treat boundary edges the same, regardless of sharpness. We
should revisit subsurf creasing to see if more consistent and
predictable results are possible, but for now this a non-intrusive way
to avoid wavyness along the boundary.

Fixes bug [#31864] Artifacts when using Subsurf+Crease on plane
http://projects.blender.org/tracker/index.php?func=detail&aid=31864&group_id=9&atid=498