Optimized commutator
Description
Optimize the batchified calculation of the commutator. Tests on GaAs, for which the commutator cost was larger than the Laplacian, show a improvement by a factor larger than two.
News snippet
Optimize the batchified calculation of the commutator.
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.