gwpy/gwpy: 0.9.0

Development release of GWpy Backwards-incompatible changes: [#703] removed gwpy._version_helper module [#708] modified behaviour of known segmentlist during DataQualityFlag logic operations Backwards-compatible changes: [#704] added XOR logic method for DataQualityDict [#705] added new TimeSeries.demodulate method [#707] added support for a new GWPY_CACHE environment variable, which defaults cache=True for all open data methods [#711] added support for writing extra attributes to LIGO_LW XML when writing segments Bug fixes (including package, unit test, and documentation updates): [#680] fixed bugs in gwpy.signal.fft [#682] simplified gwpy.utils.lal to support only lal>=6.18.0 [#684] fixed bugs in slicing Array2D [#685] fixed bugs related to glue-1.58.1 [#688] fixed name output for TimeSeries boolean logic [#690] fixed ordering of datasets when using gwpy-plot [#691] fixed bug related to using Array(..., copy=True) [#692] new example to demonstrate FrequencySeriesAxes.plot_mmm [#698] fixed SpectralVariance.yspan [#701] deprecated the @axes_method decorator (gwpy.plotter) [#706] fixed bug in sorting LOSC datasets based on GPS times [#709] fixed bugs in subclassing of gwpy.plotter.SeriesAxes [#714] fixed bug in BodePlot frequencies keyword [#715] added workaround for segmentation fault in frameCPP [#717] deprecated custom properties of gwpy.plotter.Axes [#719] simplified internal calls to gravityspy similarity search [#681,#687,#702] numerous style and complexity improvements [#689,#693,#700,#712] documentation improvements [#695,] a few continuous integration and testing updates See https://github.com/gwpy/gwpy/compare/v0.8.1...v0.9.0 for a full statement of what has changes since the last release