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Implement a batchified version of the multigrid preconditioner.

Nicolas Tancogne-Dejean requested to merge batchify_multigrid into develop

Description

Implement a batchified version of the multigrid preconditioner. This makes the combination RMMDIIS + multigrid faster. A test is added to cover this combination. This also fixes a bug for non-orthogonal cells with the multigrid preconditioner.

News snippet

Optimization of the multigrid preconditioner for RMMDIIS.

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.
Edited by Nicolas Tancogne-Dejean

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