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Enable grid transfers in parallel

Sebastian Ohlmannrequested to merge
grid_transfer_parallel into develop

Description

Use the partition_transfer class to enable parallel grid transfers, i.e. between two different meshes that might have different parallelizations. The restrictions of partition_transfer apply, i.e. the MPI groups cannot be arbitrary.

News snippet

Enable parallel grid transfers

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 Sebastian Ohlmann

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