permit bypassing gbsa by setting setGbsaGlobalScaleFactor to zero update potential energy with gbsa component
permit bypassing gbsa by setting setGbsaGlobalScaleFactor to zero
update potential energy with gbsa component


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