Blender Git Loki

Fix bug 29123, subdivide smooth distorts shape with numcuts > 1.

Three fixes:

* When smoothing a coord, the original position should be based off
the unsmoothed subdivision (i.e. the vertex coord rather than the
smoothed position in the shapekey)

* The normal of new vertices created by edge split must be updated
(used the same interpolation as pre-bmesh here)

* The vertices created inside the subdivided face should use the
subdivided coords from edges, so copy the shapekey coords back to
vertex coords after subdividing edges