Add MPI support for the wannier90_state runmode of oct-wannier90 utility.
Description
Add MPI support for the wannier90_state runmode of oct-wannier90 utility. Generic routines to find global min/max from local values are introduced.
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.
Edited by Nicolas Tancogne-Dejean