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Fix/MPIData::getType when T is a reference

Nils-Arne Dreier requested to merge nils.dreier/dune-common:fix/mpidata_gettype into master

I encountered a bug in mpidata.hh, when I want to use it with allreduce and MPI_SUM and double&. The problem was that MPIData detected a custom MPI_Datatype where MPI_DOUBLE is necessary to use it with MPI_SUM.

This MR fixes that problem by using decay_t in the MPIData class.

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