added hydrogen wavelength computer to speclines.optical
added hydrogen wavelength computer to speclines.optical

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