Merge photon related input for RDMFT and OEP
Description
Merge the input options related to the photon modes for RDMFT and OEP. Also, now both implementations use the same module to handle photon modes.
News snippet
Merge the input options related to the photon modes for RDMFT and OEP.
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 #292 (closed)
Edited by Martin Lueders