Pangs of nostalgia are inevitable upon seeing or revisiting “L’innocente,” the 1976 film that would be Luchino Visconti’s last. The sixties and seventies were two of the most remarkable and prolific decades of cinema--Italian cinema the most idiosyncratic of all so that the works of extraordinary directors such as Fellini, Scola, Pasolini, Antonioni or Bertolucci