Add Coordinate member variable to hold old user-specified MotionType.
Add Coordinate member variable to hold old user-specified MotionType.

opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core,opensim-org/opensim-core