Permit use of metabolic probes with and without revisions

Add properties so users can easily enable/disable revisions to [Umberger](https://github.com/opensim-org/opensim-core/blob/master/OpenSim/Simulation/Model/Umberger2010MuscleMetabolicsProbe.cpp) and [Bhargava](https://github.com/opensim-org/opensim-core/blob/master/OpenSim/Simulation/Model/Bhargava2004MuscleMetabolicsProbe.cpp) probes.
