Whit Stillman’s elegant, witty Love & Friendship, based on Lady Susan, an unpublished novella by Jane Austen, opens this Friday after premiering in the Premieres section of the 2016 Sundance Film Festival. Unsurprisingly, the pairing of Stillman, known for his sophisticated comedies of social mores, and Austen, beloved for her 19th-century romantic fiction, proved to be as well-made a match as any that might appear in the works of the English author. Before the film’s premiere, Stillman, who made his Sundance debut in 1990 with Metropolitan, even joked to the audience that his films “have often been accused of being set in Georgian times.