waqasbhatti/astrobase: astrobase v0.4.0

This is a new major release. Several modules have been moved around. Most public facing modules and functions now have full docstrings that auto-generate Sphinx documentation (https://astrobase.readthedocs.io).

Work for the v0.4 series of releases will be tracked at:

https://github.com/waqasbhatti/astrobase/projects/1

• New top-level lcproc, checkplot, and lcfit subpackages.
• services.mast: now has a tic_xmatch function.
• lcfit.transits: added new mandelagol_and_line_fit_magseries function (by @lgbouma).
• timeutils: added new get_epochs_given_midtimes_and_period function (by @lgbouma).
• New periodbase.abls module to use Astropy 3.1's BoxLeastSquares as the BLS runner instead of the wrapped eebls.f used by periodbase.kbls. periodbase.kbls remains the default implementation when you do from astrobase import periodbase. You can call periodbase.use_astropy_bls() immediately after importing periodbase to switch the default BLS implementation to periodbase.abls.

• varbase.lcfit has been moved to a new top-level subpackage called lcfit, and is broken up into lcfit.sinusoidal, lcfit.eclipses, lcfit.nonphysical and lcfit.transits submodules. The varbase/lcfit.py module will be removed in Astrobase 0.4.5.
• lcproc.py has been moved to a new top-level subpackage called lcproc, and is broken up by specific functionality.
• checkplot.py has been moved to a new top-level subpackage called checkplot, and is broken up into checkplot.pkl for making checkplot pickles, and checkplot.png for making checkplot PNGs.
• periodbase.kbls.bls_stats_singleperiod and periodbase.kbls.bls_snr now do a trapezoidal transit model fit to the prospective transit found by an initial run of BLS and calculate the transit depth, duration, ingress duration, refit period, and refit epoch that way.
• plotbase: the function plot_phased_mag_series is now called plot_phased_magseries.
• plotbase: the function plot_mag_series is now called plot_magseries.
• lcproc_aws.py has been moved to lcproc.awsrun.
• lcproc now uses JSON files stored in either [astrobase install path]/data/lcformats or ~/.astrobase/lcformat-jsons to register custom LC formats. This is more flexible than the older approach of adding these to a top-level dict in lcproc.py.
• lcfit.sinusoidal: the fourier_fit_magseries function now returns times.min() as the epoch value in its fitinfo dict (by @joshuawallace). The actual time of minimum light is returned as actual_fitepoch in the fitinfo dict.
• periodbase/oldpf.py has been moved to periodbase/_oldpf.py. It will be removed in Astrobase 0.4.2.
• The services.tic module has been deprecated and will be removed in Astrobase 0.4.2.
• The astrotess.get_time_flux_errs_from_Ames_lightcurve function has been deprecated and will be removed in Astrobase 0.4.2. Use the astrotess.read_tess_fitslc and astrotess.filter_tess_lcdict functions instead.
• We no longer run the Astrobase test suite on Python 2.7. Most things should continue to function, but there are no guarantees. Python 2.7 support will end in December 2019.

• Lots of bug fixes everywhere. See the commit history for details.