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Bugfix multigrid preconditioner

Nicolas Tancogne-Dejean requested to merge fix_boundaries_periodic_multigrid into develop

Description

Fix an invalid memory reference occuring in serial for multigrid preconditioner with periodic systems. A test is added to cover the combination multigrid+periodic systems.

News snippet

Bugfix for multigrid preconditioner.

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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