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Created originally on Bitbucket by Jason Reneuve

Was already merged in Bitbucket before import, marked as merged by the import user

• fixed bugs in examples/internal_waves_coriolis/simul_ns3dstrat_waves.py
• fixed a bug in operators.operators3d.OperatorsPseudoSpectral3D.urudfft_from_vxvyfft
• black
• changed confusing variable name in operators.operators3d.OperatorsPseudoSpectral3D.urudfft_from_vxvyfft

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