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mpi_comm_dup from the beginning

Podhorszki, Norbert requested to merge github/fork/germasch/mpicomm into master

Created by: germasch

Also came from an unrelated discussion. ADIOS2 MPI_Comm_dup()s its communicators, but potentially too late to protect from the user doing stupid things.

The first commit adds a test that triggers it. The 2nd commit is the simple fix.

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