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Fix Umklapp for HF singularity

Nicolas Tancogne-Dejean requested to merge fix_umklapp_hf_singularity into develop

Description

The Coulomb singularity was not handling properly the Umklapp for the q vector, leading to numerical instabilities and divergences for full range hybrids with k-points.

News snippet

Bugfix for Coulomb singularity for full range hybrids with k-points.

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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