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Numerical stability Broyden

Nicolas Tancogne-Dejean requested to merge fix_stabilization_broyden into main

Description

The stabilization of the Broyden matrix was not doing the job for small matrix elements. This is now changed to properly work for all values of matrix elements.

News snippet

Improve the numerical stability of the Broyden mixing.

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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