Physics and Game Engine

Fixed several bugs:

python refcounting related and Bullet related (basic add/remove object support, bounding volume hierarchy).
more game engine bug-fixes, hooked up 'formfactor' as inertia tensor tweaker, friction/restitution, more scaling related fixes.
make clear that 'concave mesh' is really for static triangle mesh. too many people try to make it moving, it is for landscapes/static environment.
rgidbody dynamics fixes (scaling again) to make Happy 2006 domino simulation to work.
See happy_2006_4.blend or happy_2006_blend.zip for the baked dominos.
remove constraint fixed, Bullet timestep now subdivides Blender game engine timestep, so it runs 60 hertz, SphereShape reverted to old style, so no support for non-uniform scaled spheres for now,
fixed ApplyForce in physicscontroller, and crashing radar sensor

テンプレート:Release Notes/2.41/Game Engine/Physics