''No Man's Land'' was shown as part of the 1985 New York Film Festival. Following are excerpts from Vincent Canby's review, which appeared in The New York Times Oct. 5, 1985. The film opens today at the Public Theater, 425 Lafayette Street. EACH of the four principal characters in Alain Tanner's ''No Man's Land'' wants to be someplace else. Madeleine, who runs a disco on the Fr...$8.5