Fix frequency shift bug in psd #105
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scipy.signal.welch outputs negative frequencies. These were not shifted properly to positive values which resulted in wrong power spectral density output (basically) for one side of the spectrum. Closes modscripps#104
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scipy.signal.welch outputs negative frequencies. These were not shifted
properly to positive values which resulted in wrong power spectral
density output (basically) for one side of the spectrum.
Closes #104