One of the funniest lines in "Love & Friendship," Whit Stillman’s hilarious and endearing new film adaptation of Jane Austen's "Lady Susan," find the conniving Lady Susan (Kate Beckinsdale) lamenting that “facts are horrid things.” It’s a philosophy perfectly at home in 2016, a year in which more than one commentator has declared our world to be “post-truth,” courtesy of the impervious-to-facts success of Donald Trump’s campaign.