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Added gwpy.signal.window module to help with FFT routines

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/gwpy.signal.window into develop

This PR adds a new module gwpy.signal.window which provides two simple routines

  • canonical_name: translates arbitrary window name into one understood by scipy (e.g. ksr -> kaiser)
  • recommended_overlap: uses Heinzel, Rüdiger, & Schilling [2002] to return the recommended overlap for a given FFTlength and window combination

The recommended_overlap method is now used to set the default overlap for all TimeSeries FFT routines, unless specified by the user.

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