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Encapsulate multi-process communication (part 3)

Podhorszki, Norbert requested to merge github/fork/bradking/mpi-encapsulation into master

Created by: bradking

Continue work after #1691 and #1817 to encapsulate multi-process communication behind a helper::Comm API:

  • Use MPI interfaces if and only if ADIOS2_HAVE_MPI is defined. Everything besides SST now uses either helper::Comm for general-purpose communication or MPI directly in MPI-only functionality.

  • Build the MPI backend to helper::Comm (accessed via adiosCommMPI.h) only when ADIOS2_HAVE_MPI is defined. Otherwise build only the dummy backend for use in serial programs.

  • This leaves only the sst engine using mpiwrap/mpidummy (for its C code), so move their sources over into sst directories.

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