CoreNeuron nrn_mpi wrappers can be a little more high-level and accept vectors instead of pointers

Could the nrn_mpi wrappers be a little more high-level and accept vectors and hide the data-unwrapping .data() inside? Are they used inside modfile verbatims? If so then this is probably not an option (need to keep backward compat with neuron).

Originally posted by @ohm314 in https://github.com/BlueBrain/CoreNeuron/pull/273

Mar 17 '20 11:03 ohm314

I can see some clarity benfits to having a corenrnmpi namespace with the wrappers you suggest. One generally does not see mpi use in mod files (although i guess bin reporting is an exception) One very useful functionality on the NEURON side of things is the possibility of -DNRN_ENABLE_MPI_DYNAMIC=ON which means NEURON works on the user machine whether or not mpi has been installed.

Mar 17 '20 19:03 nrnhines

thanks @nrnhines ! that's good to know, then we have to tread carefully if there is a use case (bin reporting) for nrnmpi wrappers inside mod files. Anyway, I don't see this as a priority issue, just something to see how to improve in the future

Mar 19 '20 10:03 ohm314