Although Isabella Rossellini is less known stateside than in Europe the pedigreed doyenne of the moving pictures is bona fide cinema royalty. Her father is filmmaker Roberto Rossellini and her mother, Ingrid Bergman. Oh, she was married to a certain Martin Scorsese in the late seventies and later dated David Lynch. Naming her head of the jury of the Un Certain Regard (U.C.R.) program at this year’s Cannes Festival will add cachet and a dash