Forbid to run the option CurrentDensity=fast for non-orthogonal cells, as this is not working.
Description
Forbid to run the option CurrentDensity=fast for non-orthogonal cells, as this is not working, as discussed in issue #58 (closed) .
News snippet
Forbid to run the option CurrentDensity=fast for non-orthogonal cells, as this is not working.
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.