Pycheops

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* BUG FIX. In dataset.py, decontaminate=True should apply the correction
flux = flux/(1 + contam), not flux = flux*(1 - contam). Fixed.
* Avoid "Warning: converting a masked element to nan." in starproperties.py
* Clarified definition of L in EclipseModel and EBLMModel
* Fixed retrieving psf_file bug in init.py (255)
* Updated PSF reference file to average of in-flight PSFs measured at 9 CCD
locations during IOC.
* Added l_3 option to models.py, dataset.py and multivisit.py.
* Added l_3, f_c and f_s to _make_labels in dataset.py and multivisit.py
* Fixed "SyntaxWarning: "is" with a literal." from multivisit.py and core.py
* Update Contamination_33arcsec_aperture.p if older than the reference
psf_file in __init__.py

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* Fix problem with SWEET-Cat encoding (252)
* Add decontaminate method to dataset (experimental)
* Fix issue in WASP-189 notebook with missing text files for cds_data_export

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* Attempted fix in 0.9.18 to avoid hidden files in dataset() failed - fixed.

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* Updated readme, notebooks and cookbook for release of version 1.0.0