Nick Vivarelli International CorrespondentNew York and Oslo-based writer/director Mona Fastvold made her directorial debut with “The Sleepwalker,” which unlocked secrets between two sisters and made a splash in 2014 at Sundance. Her ambitious followup “The World to Come” stars Katherine Waterston and Vanessa Kirby as two farmers’ wives in 1856 Upstate New York who fall in love but have no template, no reference points as to how to handle their emotions.