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Refactored, renamed, and simplified FFT interface in gwpy.signal

Duncan Macleodrequested to merge
github/fork/duncanmmacleod/signal-refactor into develop

This PR introduces a rework of the gwpy.signal FFT interface. The highlights are:

  • gwpy.signal.fft has been renamed to gwpy.signal.spectral, and replaced with a placeholder fft.py for backwards compatibility
  • the LAL and PyCBC interfaces have been deprecated, with a view to only supporting scipy in the future, now that median-average PSDs are available (scipy>=1.2.0)
  • general simplification of the interface (in principle, attempts to maintain backwards compatibility probably make it more complicated in the short term)

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