Adding VelocityDrag physics
Actually *add* VelocityDrag source code...
Enable AdjointRefinementEstimator
Add parsing options

Related to node/edge/face mismatch and enforcement. @coreymbryant
had reported better meshes when enabling these.
\todo
Merge pull request #142 from pbauman/enable_adjoint_refinement

Enable adjoint refinement
Compatibility with latest Antioch
Restore compatibility with old Antioch

This should make it easier to hunt down any regressions in either.
Merge pull request #143 from grinsfem/nondefault_antioch

Compatibility with latest Antioch
Merge pull request #140 from grinsfem/velocity_drag

Adding VelocityDrag physics