py3 corrections to mapplot gui
py3 corrections to mapplot gui

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