Use SNClass.check_overlaps(...) in the SNClass.plot_lc(...) instead of the hacky way it is now

[RobFirth]

SNClass.check_overlaps(...) makees a list of overlapping filters. At the moment, SNClass.plot_lc(...) looks like:

if mark_spectra:

    for spec_key in self.spec:
        if verbose: print(np.nanmin(self.spec[spec_key].wavelength) - filter_uncertainty, self.phot.data_filters[filter_key]._lower_edge)
        if verbose: print(np.nanmax(self.spec[spec_key].wavelength) + filter_uncertainty, self.phot.data_filters[filter_key]._upper_edge)

        if verbose: print(self.spec[spec_key].data.meta["filename"] )
        too_blue =  self.phot.data_filters[filter_key]._lower_edge < np.nanmin(self.spec[spec_key].wavelength) - filter_uncertainty
        too_red = self.phot.data_filters[filter_key]._upper_edge > np.nanmax(self.spec[spec_key].wavelength) + filter_uncertainty
        # if self.spec[spec_key]. self.phot.data_filters[filter_key]._upper_edge and self.phot.data_filters[filter_key]._lower_edge
        if verbose: print(too_blue, too_red)
        if not too_red and not too_blue:
            ax1.plot([self.spec[spec_key].mjd_obs, self.spec[spec_key].mjd_obs],
                     [0.0, np.nanmax(self.phot.phot['flux'])*1.5],
                     ls = ':', color = hex['batman'], zorder = 0)

Should be able to replace it with:

for spectrum in self.spec:
    if filter in self.spec. _overlapping_filter_list:
        plot spec