minor improvements to test_formaldehyde_radex cl interface
minor improvements to test_formaldehyde_radex cl interface

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