fixed plotresiduals declaration
fixed plotresiduals declaration

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