Point to point superdroplet exchanges #105
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… included to allow sequential examples to run normally
…e than one MPI process
…ution is possible
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Depends on #103.
Replaces the superdroplet data exchange Alltoall MPI calls by individual Isend and Irecv calls.
Time-to-solution improvements are roughly around 4% for 32 processes and 14% for 64 processes.
Improvements should grow at least with the number of processes and number of time steps.