A three-course ordeal of icky sex, Olympian gluttony, and autoerotic dismemberment, Gyorgy Palfi’s “Taxidermia” is consistently vile. Yet it’s also a sustained, unique work of art, and well worth the mess. A triptych, the first two sections of which are based on stories by Hungarian writer Lajos Parti Nagy (the third is an original story by Palfi and his wife, Zsofia Ruttkay, and they also cowrote the screenplay), the film chronicles …