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.