Description

Adding the support of the commutator of the position operator and the +U+V nonlocal operator for spinors. Tests are added to cover the DFT+U+V with spinors.

News snippet

Adding the support of the commutator of the position operator and the +U+V nonlocal operator for 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.