Blender Git Loki

With the commit last week to have curve bevels nice circular (when no
front/back is selected), the UV coordinates for curves should also be
corrected.
This commit re-uses the same code as for Nurbs, to make sure UV coordinates
wrap around nicely.

BUT! I've noticed that Daniel's commit of august in this code actually
broke this UV correction... in his craze to cleanup old code, he missed
the actual functionality. Meaning that in 2.40 and 2.41, "UV orco" texture
coordinates wrap around ugly in Nurbs Surfaces, something that was fixed
in NaN days.

Got no time for tracker now... but I'm sure it's in there! :)