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Fixes the randomization for domain parallelization

Nicolas Tancogne-Dejean requested to merge fix_randomization_par_domains into main

Description

Fixes the randomization for domain parallelization.

The code now uses a par_vec_scatter to scatter the result of the randomization that is done on the root node of the domain parallelization MPI grid. This guaranties identical results on all tasks.

News snippet

Minor bugfix.

Checklist

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

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