Nicolas Tancogne-Dejean requested to merge mpi_cleanup into develop Nov 30, 2020

Description

Remove unnecessary MPI operations. Especially, after each file close, a Bcast was done, which was not needed at all.

News snippet

Remove unnecessary MPI operations.

Checklist

[ x] I have checked that my code follows the Octopus coding standards
I have added tests for all the new features added in this request.