The analytical continuation was not done properly.
Description
Fix a minor problem in the Broyden mixing when the mixing parameter become too small.
News snippet
Fix a minor problem in the Broyden mixing when the mixing parameter become too small.
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.
Edited by Nicolas Tancogne-Dejean