[Dune] [#787] merge MPI-datatype stuff from istl and common

[Dune]

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The following task is now closed:

FS#787 - merge MPI-datatype stuff from istl and common
User who did this - Oliver Sander (sander)

Reason for closing: Implemented
More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=787

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