setup non-mult parameters for hfb (yuck!)

def setup_hfb_pars(self):
        """setup non-mult parameters for hfb (yuck!)

        """
        if self.m.hfb6 is None:
            self.logger.lraise("couldn't find hfb pak")
        tpl_file,df = pyemu.gw_utils.write_hfb_template(self.m)

        self.in_files.append(os.path.split(tpl_file.replace(".tpl",""))[-1])
        self.tpl_files.append(os.path.split(tpl_file)[-1])
        self.par_dfs["hfb"] = df