Resolve "enable PSOLVER for sequential runs"

Martin Luedersrequested to merge
282-enable-psolver-for-sequential-runs into develop

Description

This MR will allow using the PSolver library also in sequential runs, as well as using the sequential PSolver library for a given MPI task.

News snippet

Remove dependency of using the PSolver library on MPI

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.

Closes #282 (closed)

Edited by Martin Lueders

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