WIP: Multisystem exp propagator
Description
Adding a new multisystem propagator, the exp_mid propagator.
News snippet
Adding a new multisystem propagator, the exp_mid propagator.
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.
Depends on !794 (merged)
Edited by Micael Oliveira