unique MPI communication space etc
* normalize MPI communicator handling by putting some default code in DataAdaptor and AnalysisAdaptor base classes. The defaults are to use isolate our communciation in a duplicate of COMM_WORLD. Adaptors needing to do MPI communicaiton should access the communicator by calling GetCommunicator. * report errors from ConfigurableAnalysis::Execute and ::Finalize * fix a build issue with new VTK AMR writer. * clean up warning in parallel 3d miniapp squash me -- amr reader build fixes"
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