Pycheops

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* Add fix for SSLCertVerificationError to README.rst

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* PlanetModel renamed to HotPlanetModel
* Multivisit.fit_planet() renamed to Multivisit.fit_hotplanet()
* New PlanetModel that assumes flux from planet is due to reflection
* Multivisit.fit_planet() now assumes flux from planet is due to reflection
* Ensure funcs.eclipse_phase() returns phases in the range [0, 1)
* Change default keyword value a_c=0 to a_c=None so that it gets properly
initialised from the input datasets.

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* Improved visibility calculation in make_xml_files. Visibility for stars with
ecliptic latitude <-60,>+60 is now 0 (CHEOPS-UGE-PSO-MAN-001 section 1.3.2)

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* make_xml_files bug fix.

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* Correction to tzero parameter definitions in docstrings for module funcs
* Correction to description of mask in funcs.t2z() docstring
* Removed argument "P" in call to funcs.eclipse_phase and updated docstring
* Removed "-c" option from make_xml_files
* Added funcs/contact_points()

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* New extra_decorr_vectors option in Dataset and Multivisit fitting routines.
* New Dataset.select_detrend() feature, parameter selection from Bayes factors
* New MultiVisit.fit_planet() method for transit+eclipse fitting.
* Added 'tag' option to Dataset.save() and Multivisit.save()
* Added Dataset.from_pipe_file()
* Added MultiVisit.save() and MultiVisit.load() (176)
* Added "copy=False" in call to interp1d in Dataset._make_interp().
* Changed zero-point of scaling for xoff, yoff, bg, etc. to median instead of
mid-point of the values - should reduce correlation with 'c'.
* Updated description of parameter scaling in Dataset.lmfit_transit().
* In Dataset, set source automatically from file_key if not specified by user.
* Added xlim option to Dataset.plot_lmfit() and Dataset.plot_emcee().
* Added esinw, ecosw, T_tot, etc. to parameters for eccentric orbits in
the fitting routines in Dataset and MultiVisit.
* Added notes on unwrap and nroll to fit report in MultiVisit (285)
* Raise error if initial value is out of range for Dataset or MultiVisit.
* Scaling of contam, smear and bg in MultiVisit, now consistent with Dataset
* Added target location on CCD to verbose output for Dataset.get_lightcurve()
* In Dataset, yoff was measured relative to the wrong value - fixed.
* Improved initialisation of walkers in MultiVisit fit routines - use standard
deviation based on previous fits rather than arbitrary values.
* Added overwrite=False keyword option to MultiVisit.save() and Dataset.save()
* Fix problem with automatic selection of x limits in MultiVisit.plot_fit()
* Fix problem on 'c' missing from parameters if fixed for MultiVisit
* Fix bug in calculation of rms for MultiVisit
* Fix display of prior for T_0 in MultiVisit.corner_plot()
* Allow list input to combine.combine()
* Added custom_labels option to MultiVisit.corner_plot()