[Dune] [#943] scan and allgather missing in MPICollectiveCommunication

[Dune]

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FS#943 - scan and allgather missing in MPICollectiveCommunication
User who did this - Robert Klöfkorn (robertk)

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MPI_Scan can for example be used to sum up some values starting from proc 0 to your onw current rank, for example. 

The other MPI methods should also be available in some C++ class in DUNE, of course not the collective communication. Of course, this is some amount of work.  

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