Hotfix divergence nonorthogonal
Description
The divergence was not correctly calculated, making GGA and MGGA calculations not correct for non-orthogonal cells.
News snippet
The divergence was not correctly calculated, making GGA and MGGA calculations not correct for non-orthogonal cells.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.