Pycheops

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* Updated make_xml_files to cope with change to data table format returned by
astroquery.gaia.

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* Added 'L_0' to list of valid plotkeys in multivisit.corner_plot() and
tidied-up logic so that invalid keys can return a helpful error message.

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* Update make_xml_files and fix bug with N_Ranges being ignored.

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* Added (insecure) work-around for SSL: CERTIFICATE_VERIFY_FAILED problem in
StarProperties when downloading SWEET-Cat.

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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.