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Encapsulate multi-process communication

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

Created by: bradking

Much of ADIOS's functionality is applicable to any multi-process communication environment, not just MPI. Disconnect the non-MPI-specific parts of our implementation from MPI. Replace direct use of MPI_Comm and MPI functions with a helper::Comm wrapper that encapsulates MPI functionality. This makes room for future abstraction of multi-process communication behind the encapsulated API.

Start by encapsulating MPI functions and the types MPI_Comm, MPI_Request, and MPI_Status behind wrappers in helper::Comm. For now leave encapsulation of MPI constants to future work.

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