Acbn0 noscreening
Description
Allow for changing the amount of screening taken into account in the ACBN0 functional, from bare Hartree-Fock (0% screening) to the fully screened (original ACBN0 functionl, 100% screening).
News snippet
Allow for changing the amount of screening taken into account in the ACBN0 functional.
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.