Toward gauge-field as a system
Description
This merge request is preparing the code to have the gauge field treated as a multisystem. This implies moving some part of the code and changing some of the routines. The behavior of the code is at the moment unchanged.
News snippet
Preparing the code to have the gauge field treated as a multisystem.
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.