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TimeSeries.q_transform: improved frequency recovery

Duncan Macleod requested to merge github/fork/duncanmmacleod/qtransform-freqencies into master

interpolation happens at exact frequencies, so need to operate on proper frequencies for both the QRow and the desired frequencies, then shift down by fres/2. for the output Spectrogram bins

Fixes #265 (closed). With this code, I get the following equivalent output for the example given in #265 (closed):

figure_1

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