astrobase v0.4.2

Changes

• All lcfit functions now use scipy.optimize.curve_fit instead of scipy.optimize.leastsq previously. This appears to produce much more reasonable fit parameter error estimates.
• periodbase.kbls: The BLS stats functions now check for a sensible transit model when calculating stats (transit depth, duration, SNR, refit period and epoch).
• checkplot.png: Added option to overplot circle on DSS finder-charts. checkplot.png.twolsp_checkplot_png can now return a matplotlib.Figure. Added by @lgbouma in #86.

Fixes

• lcproc.tfa: Fixed caching of collected LC info when generating a TFA template.
• checkplotserver: Fixed column errors in exported CSV from the interface (#85).

Removed

• Removed deprecated function astrotess.get_time_flux_errs_from_Ames_lightcurve. Use astrotess.read_tess_fitslc instead.
• Removed deprecated module services/tic.py. Use services/mast.py instead.