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Fix MGGA-OEP

Nicolas Tancogne-Dejean requested to merge fix_oep_mgga into hotfix-11.2

Description

Fix the calculation of MGGA in the Kohn-Sham framework. Before the fix, the code was not solving the OEP equation and was simply not adding the nonlocal term of the MGGA to the Hamiltonian.

News snippet

Fix of MGGA-OEP calculation.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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