Fix the calculation of the cutoff of the 3D FFT with zero boundary conditions.
Description
Fix the calculation of the cutoff of the 3D FFT with zero boundary conditions.
News snippet
Fix the calculation of the cutoff of the 3D FFT with zero boundary conditions.
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.