Implements the GGA with spinors

Nicolas Tancogne-Dejeanrequested to merge
noncollinear_gga into main

Description

Implements the GGA with spinors. This is done following Peralta, Scuseria, and Frisch, PRB 75, 125119 (2007).

News snippet

Implements the GGA with spinors.

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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