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