If no MPI stack is found ExternalLibraries/MPI will build its own MPI library and runtime tools and install eg the tools into `exe/sim/mpirun` which is the expected location for utilities build by thorns.

However generic.run does not use this mpirun meaning that in situations where MPI is not present (ie someone’s laptop) one has to manually edit RunScript

Pull request:

https://bitbucket.org/simfactory/simfactory2/pull-requests/46/generic-search-for-self-build-mpirun

adds exe/sim to PATH in generic.run so that, if present, mpirun from there is used.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2460/search-for-self-build-mpirun-in-genericrun