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New TimeSeries.q_transform method

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/qscan into master

This PR introduces a gwpy implementation to the original-MATLAB Q-transform scan, via the TimeSeries.q_transform instance method. Included are tests and an example, which produces this image:

qscan

[NB: these data are from the S6 blind injection, and do not contain an astrophysical signal]

Thanks to @scottcoughlin2014 for the original MATLAB-python conversion as part of the GravitySpy project

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