Resolve "Enabling free Maxwell propagation in multisystem mode, part 2/4"
Description
Allow Maxwell propagation with external currents.
News snippet
Allow Maxwell propagation with external currents.
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 #206 (closed)
Edited by Franco Bonafé