If you are making “high concept” film it helps if you are talented and highly respected director. And even more so if your basic premise is connected to important social issue that can be presented in ways that win hearts of most critics. That is lesson learned with *Green Card*, 1990 romantic comedy written and directed by Peter Weir. Protagonist, played by Andie MacDowell, is Brontë Parrish, horticulturalist who h…