Pycheops

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* Changed instances of BJD_TDB to BJD_TT in the docstrings for dataset.py and
multivisit.py. (Difference is < 1 ms)
* Updated import commands in dataset.py and __init__.py for
photutils.CircularAperture and photutils.aperture_photometry

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* Added SpotCrossingModel,TransitModel1Spot and TransitModel2Spot to models.
* Fix to plotting with glint in dataset (320)
* Avoid need for aperture and decontaminate keywords in
dataset.get_lightcurve() for Kepler/TESS data from pycdata
* Avoid "No metadata" warning when loading Kepler/TESS data from pycdata
* Added omega as a derived parameter for all models that have parameters f_c,
f_s, and updated other models to have the same expression for this value.
* Updated pycheops cookbook to version 1.1 from Pia Cortes Zuleta

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* Update dataset.animate_frames() (Tom Wilson)

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* Cookbook updated (Pia Cortes Zuleta)

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* Example notebooks updated.

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