Current: use batched gradient
Description
The current now uses the batched gradient calculation also for non-orthogonal cells.
Closes #58 (closed). Depends on !743 (merged).
News snippet
Current uses batched gradient 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.
Edited by Martin Lueders