On lazy afternoons near St. Tropez, Daniele Delorme’s Colette writes about her failures at love until the younger, often-shirtless Jean Sorel arrives — but then her even younger friend Dominique Sanda arrives, too. Adapted from Colette’s own autobiographical novel (Delorme had been her original Gigi on screen), in uncharacteristic low-keyed intimacy, with Mendelsohn score.