add new LTE molecule model
add new LTE molecule model

pyspeckit/pyspeckit,pyspeckit/pyspeckit,allisony/pyspeckit,e-koch/pyspeckit,jpinedaf/pyspeckit,keflavich/pyspeckit,low-sky/pyspeckit,mikelum/pyspeckit,vlas-sokolov/pyspeckit,keflavich/pyspeckit,low-sky/pyspeckit,allisony/pyspeckit,mikelum/pyspeckit,e-koch/pyspeckit,jpinedaf/pyspeckit,vlas-sokolov/pyspeckit