Blender Git Loki

- SCons: add WITH_BF_ASSIMP=False and WITH_BF_FBX=False to all configs.

+ SCons build for bf_fbx, bf_assimp and ext_assimp (off by default, not in config yet)

Revert previous commit and fix crash. Found the cause on MinGW since it
won't excuse uninitialized variables. projectSVdata still does the wrong
thing, better fix it than disable it though.

An option to turn off the floating controls from the user preferences, or move them to different areas of the screen.

disable data interpolation through projectSVdata. The function causes
crashes with the new uv transform correction code, probably due to the
already known shrinking effect. I could generalize the data
interpolation function I have written for all custom data but it
requires preprocessing to detect data space islands. I hope I can figure
out a way to fix this properly, possibly using a combination of the two
codes.

UV transform correction
========================
* Big rewrite of the tool, now properly supporting seams and extensions
outside mesh boundaries.
* todo, coming ASAP is fixing of exceptional case where boundary edges
are parallel (needs another way to map to data space)

UV transform correction
========================
* minor speedup, calculate edge lengths only on startup.

Utility function, project point along vector to plane. will be needed
for uv transform correction.

Support for columns to lay out items in the center or bottom. Currently it's only used for the 3d view so it uses the entire region height to calculate, this may not work in other cases.

Armature animation improvements.

Shift actually does not do anything here anymore.

More fixes for brush overlay.

merge with trunk 48648

Define static glew for sculpt and paint since I use a few extra GL calls that reference extensions.

Switch the floating controls panel over to python drawing.

Update this description to reflect its new behavior since the drag-select patch.

Give the main 3d window a UI handler so it can process button events.

leaf bone fix.
the length of the leaf bones are set to the minimum length of non leaf bones.

Created an invisible region that lays over top of the 3d view and can be used for placing floating controls. The controls can't be interacted with yet.

Fix rake overlay for image editor