jbt.get_backgrounds docstring is out of date

[aggle]

The docstring for jbt.get_backgrounds() doesn't agree with the arguments of the function.

Docstring:

Parameters
    ----------
    ra: float
        Right ascension in decimal degrees
    dec: float
        Declination in decimal degrees
    wavelength: float
        Wavelength at which the bathtub curve is calculated, in micron
    thresh: float
        the background threshold, relative to the minimum.  Default=1.1, which corresponds to <5% above the minimum background noise.
        Note that the actual noise difference will be even smaller, as there are often other significant sources of noise than just the
        background (source shot noise, detector noise, etc.).
    plot_background: bool
        whether to plot the background spectrum (and its components) for this day.
    thisday: int
        calendar day to use for plot_spec.  If not given, will use the average of visible calendar days.
    plot_days: bool
        whether to show the plot of background at wavelength_input versus calendar days
    showsubbkgs: bool
        whether to show the components of the background in the bathtub plot.
    write_bathtub: bool
        whether to print the background levels that are plotted in plot_days to an output file
    outfile:     output filename

Arguments:

ra, 
dec, 
wavelength, 
thresh=1.1, 
plot_background=True, 
plot_bathtub=True, 
thisday=None,
showsubbkgs=False, 
write_background=True, 
write_bathtub=True, 
background_file='background.txt',
bathtub_file='background_versus_day.txt'