Set MPI parallelization scheme by environment variable

Lukas Scheel-Platzrequested to merge
mpi_scheme_by_environment into NIFTy_5

Until now, the MPI parallelization scheme used in a NIFTy installation is hard coded at installation time. With this patch, the MPI parallelization scheme can be set via the environment variable NIFTy_MPI_SCHEME at runtime.

Possible values are "Standard", "Samples" and "None". If the environment variable is not set, the "Standard" scheme is chosen.

Edited by Lukas Scheel-Platz

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