Make MPI-2 mandatory
Description
Make MPI-2 mandatory. This MPI standard is already quite old and should be supported by any major MPI library.
News snippet
MPI-2 is now mandatory.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Closes #368 (closed)
Edited by Micael Oliveira