Pycheops

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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()

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* Added "aperture" attribute to Dataset to store aperture name.
* Added scaling of detrending functions to Dataset.aperture_scan()
* Added N_data to output of Dataset.aperture_scan()
* Added copy_initial option to Dataset.aperture_scan()
* Added "ramp" in Dataset.aperture_scan() - was documented but not implemented
* Dataset.aperture_scan(return_full=true) now also returns time,flux,flux_err

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* Fixed bug in calculation of the Moon - target separation for planet_check()
* Added funcs.delta_t_sec(), light travel time correction for eclipses.

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