Batchify MGGA term
Description
Batchify the application of the MGGA term, except for the diverge term. The application of the vtau potential, as well as the boundary conditions are therefore batchified and done on the GPU is supported.
News snippet
Optimization for the MGGA with kinetic-energy dependence.
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.