Draft: Magnon kick with DFT+U
Description
Add the support of the spiral boundary condition for DFT+U. At the moment, only the case AOSubmesh=yes is supported.
News snippet
Add the support of the spiral boundary condition for DFT+U.
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.