Improve the format of the +V output

Nicolas Tancogne-Dejeanrequested to merge
improve_format_dft_u_v into develop

Description

Improve the format of the +V output to avoid display problems when there is more that 9 orbital sets.

News snippet

Minor improvement of the output format of some DFT+U+V information.

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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