Generate the command for running the likelihood scan.

def command(self, outfile, configfile, pix):
        """
        Generate the command for running the likelihood scan.
        """
        params = dict(script=self.config['scan']['script'],
                      config=configfile, outfile=outfile, 
                      nside=self.nside_likelihood, pix=pix,
                      verbose='-v' if self.verbose else '')
        cmd = '%(script)s %(config)s %(outfile)s --hpx %(nside)i %(pix)i %(verbose)s'%params
        return cmd