Adds the support of DFT+U with spinors on GPUs
Description
Adds the support of DFT+U with spinors on GPUs. Test on the ground state of NiO with the Chebyshev filtering shows a speedup of roughly a factor of 7.
News snippet
Adds the support of DFT+U with spinors on GPUs
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.