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Moved the multigrid object used for the preconditioner from the grid to the preconditioner

Micael Oliveirarequested to merge
move_multigrid_preconditioner_to_preconditioner into develop

Description

Moved the multigrid object used for the preconditioner from the grid to the preconditioner itself. This revelead an issue with the linear solvers: the solver could use the multigrid preconditioner without ever initializing it.).

News snippet

Moved the multigrid object used for the preconditioner from the grid to the 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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