PHOEBE 2.2.0

• Add support for interstellar extinction/reddening.
• Support for Python 3.6+ in addition to Python 2.7+.
• Overhaul of limb-darkening with new ld_mode and ld_coeffs_source parameters.
• Overhaul of passband luminosity and flux scaling with new pblum_mode parameter, including support for maintaining color relations between multiple passbands.
• Ability to provide third light in either flux or percentage units, via the new l3_mode and l3_frac parameters.
• Support for computing a model at different times than the observations, via the new compute_times or computes_phases parameter.
• Transition from pickled to FITS passband files, with automatic detection for available updates. The tables can now also be accessed via tables.phoebe-project.org.
• DISABLED support for beaming/boosting.
• Allow flipping Kepler's thrid law constraint to solve for q.
• Require overwrite=True during add_* or run_* methods that would result in overwriting an existing label.
• Constraint for logg.
• Account for time-dependence (dpdt/dperdt) in t0 constraints.