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adding test which splits communicator at the beginning

Pavel Kus requested to merge pkus/split_comm into master_pre_stage

and runs several elpas (still mpi-based) in parallel. Each elpa "instance" then splits its communicator to row and column communicator, as it is always done. This is actually often done in FHI-aims and was previously leading to issues when using OmniPath. Hopefully was solved by Intel MPI 2019.3. Keeping the test for future reference.

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