Fix the computation of the NLCC force to avoid numerical instabilities.

Nicolas Tancogne-Dejeanrequested to merge
fix_nlcc into hotfix-16.4

Description

Fix the computation of the NLCC force to avoid numerical instabilities.

News snippet

Fix the computation of the NLCC force to avoid numerical instabilities.

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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