Upgrade doxygen version requirement.
Upgrade doxygen version requirement.

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