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Improved dft u mixing

Nicolas Tancogne-Dejean requested to merge improved_dft_u_mixing into develop

Description

The mixing of the DFT+U ingredients (occupation matrices and U) was not done properly for the first iteration. This could slow down the convergence for +U calculations.

News snippet

Improving the mixing for DFT+U GS calculations.

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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