JuliaParallel / JuliaParallel/MPI.jl

Use `MPIPreferences` to automatically initialise MPI?

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enhancement MPIPreferences
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Julia
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Description

While playing with mpi4py earlier this week I realised it automatically initialises MPI at loading time. This can be controlled with the [`mpi4py.rc`](https://mpi4py.readthedocs.io/en/stable/mpi4py.html#runtime-configuration-options) object, including the threading setup. I think we can do something similar with an option in `MPIPreferences.jl`. How does that sound?

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