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Fix singularity

Nicolas Tancogne-Dejeanrequested to merge
fix_singularity into develop

Description

Fixes two problems with the Coulomb singularity correction: - the zero weight k-points should not contribute to the volume of the cristal - the weight of the k-points must be used, in case zero-weight k-points are used, or symmetries.

News snippet

Fixes to special cases for the Coulomb singularity correction.

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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