WIP: Add self-consistent multi-system propagator
Description
This MR adds a first very basic propagator for the multisystem container class. The aim of such propagators is to coordinate the self-consistent time-evolution of several systems contained in a multisystem container.
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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.
Edited by Heiko Appel