Blender Git Loki

BGE patch: local/global flag to distance contraint actuator.

Previously the distance constraint actuator was always working
in local axis. The local flag allows to cast the ray along a
world axis (when the flag is not selected).
The N flag works differently in this case: only the object
orientation is changed to be parallel to the normal at the hit
point.

The linear velocity is now changed so that the speed along the
ray axis is null. This eliminates the need to compensate the
gravity when casting along the Z axis.