Blender Git Loki

More fix for snapto in Pose mode:
* The code for snap to grid was completely wrong (only x pos of chan was affected�?� by z computed value!), and the same problem as with snap to cursor was present (using armature_loc_pose_to_bone is wrong here). Also, computing nearest grid point in world space! Else, it generally ends up completely out of grid, due to object transforms...
* Small cleanup of code (uneeded vars and copying).