Fix the test for non-orthogonality, that was not behaving properly on gfortran.
Description
Fix the test for non-orthogonality, that was not behaving in some cases. Some cells were not properly identified as orthogonal, even if the angles were given as 90 degrees.
News snippet
Fix the test for non-orthogonality, that was not behaving properly.
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.