constrained DFT for noncollinear magnetism.
Description
Implementation of constrained DFT for noncollinear magnetism. Two options are implemented, one for constraining the direction and one for constraining the direction and norm of the moments.
News snippet
Implementation of constrained DFT for noncollinear magnetism.
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.