Resolve "enable PSOLVER for sequential runs"
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
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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