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FFT: show error when using with MPI_COMM_WORLD

Merged Michael Kuron requested to merge fft-comm-world into master

As discovered by @schwarzmeier. I don't know whether this is a PFFT bug or an OpenMPI bug. PFFT internally creates a Cartesian communicator when using MPI_COMM_WORLD, so maybe it's just related to that.

Edited by Michael Kuron