Enable interactions for electrons and Maxwell (Maxwell-TDDFT forward-backward coupling)
Description
Enable existing current_to_mxll and mxll_fields_to_medium interactions for electrons and maxwell, calculate current when requeted by interaction, fix clocks for quantities required but not protected, enable different electronic and Maxwell timesteps.
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 Franco Bonafé