Thomas/kajiura filter nofft #12
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I think I fixed errors in the Kajiura filter FFT implementation (in particular the fixed depth has to be given as a parameter and sigma must be computed with this depth, not with h_max).
I've also added an implementation without FFT allowing variable depths, which is actually not that slow.
The figure shows eta_diff at 16s with:
FFT (depth=1000m), FFT (depth 100m), non fft:
See the thesis of Max for reference.