improve spatiotemporal spectra post-processing
After !202 (merged) is merged, some improvements to the post-processing of spatiotemporal spectra should be done :
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new function plot_thetaomega
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investigate temporal spectra options : detrend, window functions, welch -
change this TODO with an explanation of why we don't need that -
be able to plot the total poloidal spectra Kp = Khd + Kz -
be able to compute and plot the temporal spectra from this output, with toroidal/poloidal decomposition