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bindings: Always provide non-MPI constructors

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

Created by: bradking

Applications should be able to choose non-MPI constructors even when using an ADIOS with MPI support available:

  • For adios2::fstream we can simply provide overloads with and without MPI.

  • For C bindings, provide adios2_init and adios2_init_config variants named with _serial and _mpi suffixes. Define the original names using macros to match the old interface provided based on whether MPI support is available.

  • For Fortran bindings, update their implementation to cooperate with the C bindings correctly. For now we continue to provide only the MPI-based or non-MPI-based module to Fortran.

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