Include AbstractPathPoint and make note in Doxygen that Set contains any path point derived from AbstractPathPoint.
Include AbstractPathPoint and make note in Doxygen that Set contains any path point derived from AbstractPathPoint.

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