Pycheops

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* Replaced np.int and np.float with int and float everywhere. (292)

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* Added Dataset.aperture_scan() to help users find the best aperture choice
* Changed scaling of bg, contam and smear basis functions for decorrelation
from (0,1) to (-1,1). This reduces the strong correlations between the
constant scaling factor "c" and the decorrelation coefficients dfdbg,
dfdsmear and dfdcontam.
* Update examples/Notebooks/KELT-11b for consistency with changes above.
* Change examples/Notebooks/WASP-189 to download data from DACE. Remove
example data examples/Notebooks/CH_PR100041_TG00020?_V0102.tgz
* Catch decorrelation against parameters with zero range in
dataset.lmfit_transit and dataset.lmfit_eclipse. (207)
* Remove power2
* Fixed "warnings is not defined" bug in planetproperties.
* Replace python-dace-client dependency with dace-query.
* Suppress UnitsWarning in Dataset when reading from FITS files.
* Add advice to update config file if psf_file generates KeyError
* Add IPython to requirements in setup.py

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* Fix bug in dataset.load() for datasets with no defined model

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* Fixed bug in Dataset that prevents import of R25 aperture lightcurve.
* Temporarily disabled power2

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* Use parameter stderr values to initialize walkers in Dataset.
* Default init_scale value in Dataset fit functions changed from 0.01 to 0.5

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* Enable Dataset to load old saved datasets with no __scale__ attribute