Blender Git Loki

Bug #3681 The never ending bump mapping saga!

With the fix over a month ago, which added correct texture space vectors for
the bump, gave results so crispy that normals could invert after normalize.
This only when the normal "fac" slider was > 1.0.

The normals from imagetextures now get clipped to prevent it to result in
flipping normals. Will do more tests though...

Also note that the real good way would be have the tangent vectors for the
actual render normal available to perturb for bump, thats another story.