573ed73be85d7f6342567bdaebbd0662c7428800

also rename backface_culling --> use_backface_culling (which is used elsewhere in rna)
Reverting change to solver_relax.h from commit 40539, caused this nasty bug http://projects.blender.org/tracker/?func=detail&atid=498&aid=28748&group_id=9
…
Description
No description provided
Languages
C++
78.1%
Python
15%
C
2.8%
GLSL
1.8%
CMake
1.2%
Other
0.9%