Starting to implement class-based convergence criteria.
Description
Refactoring of the SCF code to use class-based convergence criteria. This is now using the multisystem quantities. This merge request is part of a larger effort to move electrons to the new framework.
News snippet
Refactoring of the SCF code to use class-based convergence criteria.
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.