SideSetsAroundSubdomain runs with ParallelMesh.

The algorithm doesn't use flood().

Refs #2129.
rz cylindrical gap conductance capability comments incorporated per #3142
Made meshChanged a virtual function #3163
Merge pull request #3146 from novasr/feature_3142

rz cylindrical gap conductance capability per #3142
Merge pull request #3165 from snschune/feature_3163

Made meshChanged a virtual function
CISRO - closes #3170
Merge pull request #3171 from permcody/CISRO_fixes

CISRO - closes #3170