Stingray v. 2.3.0

New Features

• Added summed_flag to power_confidence_limits, to make it work
  with averaged powers too.
  (#952)
• Add function to save spectra in Xspec-compatible format
  (#957)
• Add possibility to save to Xspec format for covariance/variability
  spectra
  (#963)
• Improve treatment of coherence
  (#965)

Bug Fixes

• Fixed EventList.read to properly pass **kwargs.
  (#950)
• Fixed an error in power_confidence_limits that led to
  systematically narrower confidence intervals.
  (#951)
• Fixed uncertainty propogation error in Lightcurve.rebin()
  (#953)
• Fixed convergence issues in power_upper_limit for summed powers
  and low count rates by replacing minimize with brentq.
  (#954)
• Fix initialization of countrate_err if errors are Poisson
  (#958)
• Fix array_attrs property of Lightcurve
  (#959)
• Speedup and improve robustness of fill_bad_time_intervals
  (#968)