- Added Constraint::Spherical as a synonym for Ball to match the equivalent MobilizedBody type. - Cleaned up some doxygen documentation.
- Added Constraint::Spherical as a synonym for Ball to match the equivalent MobilizedBody type.
- Cleaned up some doxygen documentation.

elkingtonmcb/simbody,robojukie/simbody,simbody/simbody,elkingtonmcb/simbody,scamille/simbody,robojukie/simbody,simbody/simbody,Gjacquenot/simbody,chrisdembia/simbody,Gjacquenot/simbody,Gjacquenot/simbody,elkingtonmcb/simbody,scamille/simbody,elen4/simbody,chrisdembia/simbody,elen4/simbody,scamille/simbody,robojukie/simbody,chrisdembia/simbody