THE CASSANDRA CROSSING (1976, UK/Italy/West Germany, 129m, PG) ** Drama, Thriller dist. AVCO Embassy Pictures (USA), Twentieth Century Fox Film Company (UK); pr co. Associated General Films / International Cine Productions / ITC Entertainment; d. George P. Cosmatos; w. Tom Mankiewicz, Robert Katz, George P. Cosmatos (based on a story by Robert Katz and George…