Plot an all-sky finder chart. This *does* create a new figure.

def allskyfinder(self, figsize=(14, 7), **kwargs):
        '''
        Plot an all-sky finder chart. This *does* create a new figure.
        '''

        plt.figure(figsize=figsize)
        scatter = self.plot(**kwargs)
        plt.xlabel(r'Right Ascension ($^\circ$)'); plt.ylabel(r'Declination ($^\circ$)')
        #plt.title('{} in {:.1f}'.format(self.name, epoch))
        plt.xlim(0, 360)
        plt.ylim(-90,90)
        return scatter