DFT+U stress tensor
Description
Implements the contribution from LDA+U stress tensor to the stress tensor.
Closes #678
News snippet
Implements the contribution from LDA+U stress tensor to the stress tensor.
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.
Edited by Nicolas Tancogne-Dejean