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Avoid Alltoall in createFromSends

Arndt, Daniel requested to merge github/fork/masterleinad/avoid_all_to_all into master

Created by: masterleinad

For a large number of processes, it should be better to avoid MPI_Alltoall and compute the number of messages to receive instead and then just perform necessary point-to-point communication.

I still need to measure if there is an impact on larger runs.

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