XCrysden output
Description
This was leading to a problem in the xcrysden output, resulting in a wrong transpose of the cell. Some software were ignoring this bug by reading only the first definition of the lattice vectors.
News snippet
Fix a bug with the xcrysden output 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.