On nifty2go branch: Domain of signal fields

I think there is an inconsistency in the current nifty2go branch. The WienerFilter and CriticalFilter classes assume the signal field to live in harmonic space whereas the Nonlinear* classes assume it to be in signal space.

What is the reason for having implemented WienerFilterEnergy and Curvature this way? How do we resolve this inconsistency?

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