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Allow building ADIOS with MPI using a serial HDF5

Podhorszki, Norbert requested to merge github/fork/bradking/parallel-adios-serial-hdf5 into master

Created by: bradking

The HDF5 IO engine now uses MPI optionally. Support is enabled at runtime when the application creates an ADIOS factory with a MPI communicator. This option is available only if HDF5 was built with MPI support. Therefore we can now optionally build ADIOS with MPI support using a HDF5 without MPI support and adapt functionality accordingly.

Update the build system to support this combination. Update the test suite to work with it.

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