Fixed broken calcBodySpatialVelocityInBody() in MobilizedBody base class.
Fixed broken calcBodySpatialVelocityInBody() in MobilizedBody base class.

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