convert json to lte

            return tuple of json, lte file content

def json2lte(self, filename):
        """ convert json to lte

            return tuple of json, lte file content
        """
        data_json = open(filename, 'r').read().strip()
        latins = lattice.Lattice(data_json)

        self.lattice_instance = latins
        self.all_beamlines = latins.getAllBl()
        if self.use_beamline is None:
            self.use_beamline = 'BL' if 'BL' in self.all_beamlines else self.all_beamlines[
                0]
        bl_ele_list = [latins.getFullBeamline(k, True)
                       for k in self.all_beamlines]
        self.beamlines_dict = dict(zip(self.all_beamlines, bl_ele_list))

        data_lte = latins.generateLatticeFile(self.use_beamline, 'sio')
        return data_json, data_lte