Setup example for 2 proc test with 2 faults.
MeshIO: Broadcast the space dimension so that block size gets set correctly
HDF5: Short circuit new Plex code
- We will eventually switch over to it
Switch to HDF5Ext output in test to expose bug.
Fix bug related to HDF5Ext data writer coordinate output.

Simplify output of vertex coordinates by using a temporary field. Fixed bug related to outputting coordinates field in parallel.
Merge branch 'knepley/fix-parallel-mult-faults'

* knepley/fix-parallel-mult-faults:
  Fix bug related to HDF5Ext data writer coordinate output.
  Switch to HDF5Ext output in test to expose bug.
  HDF5: Short circuit new Plex code - We will eventually switch over to it
  MeshIO: Broadcast the space dimension so that block size gets set correctly
  Setup example for 2 proc test with 2 faults.