TimeSeries.csd{_spectrogram}: fixed bugs introduced by v0.5
This PR fixes bugs in the processing of cross spectra and spectrograms via TimeSeries.csd
and (more importantly) `TimeSeries.csd_spectrogram.
In the process, I have depcrecated the cross
keyword argument in TimeSeries.spectrogram
, users should just use TimeSeries.csd_spectrogram
, and added a test for the deprecation warning.