Fix all MPI function calls to match interfaces and make MPI module default

Description

This makes the code safer because the compiler can match the calls to the interfaces provided by the MPI library.

News snippet

Fix all MPI function calls to match interfaces and make MPI module default

Checklist

• I have checked that my code follows the Octopus coding standards

changed milestone to %12.0

added Build system Core labels

assigned to @micael.oliveira

Codecov Report

Merging #1620 (94a34a36) into develop (e21ef232) will decrease coverage by 0.00%. The diff coverage is 40.00%.

@@             Coverage Diff             @@
##           develop    #1620      +/-   ##
===========================================
- Coverage    66.73%   66.72%   -0.01%     
===========================================
  Files          538      538              
  Lines        95389    95388       -1     
===========================================
- Hits         63656    63652       -4     
- Misses       31733    31736       +3     

Impacted Files	Coverage Δ
src/electrons/forces_inc.F90	82.82% <0.00%> (ø)
src/grid/mesh_partition.F90	61.93% <0.00%> (ø)
src/grid/par_vec.F90	70.03% <0.00%> (-0.11%)
src/grid/par_vec_inc.F90	35.63% <0.00%> (ø)
src/grid/partition.F90	44.20% <0.00%> (+0.42%)
src/grid/partition_transfer.F90	59.09% <0.00%> (ø)
src/grid/partition_transfer_inc.F90	60.00% <ø> (ø)
src/scf/lcao_inc.F90	78.04% <ø> (ø)
src/grid/boundaries_inc.F90	82.76% <33.33%> (+0.28%)
src/grid/mesh_init.F90	81.56% <40.00%> (ø)
... and 9 more

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approved this merge request

enabled an automatic merge when the pipeline for 94a34a36 succeeds

mentioned in commit 60cc8951

merged