Saturday. Adaptations of the brilliant, darkly alluring work of Roald Dahl span generations, so it makes sense that a series honoring the author would give itself a chance to stretch out. Denver Film Society’s “Welcome to the Dahl House,” which began June 4 with “Willy Wonka and the Chocolate Factory,” continues with Wes Anderson’s peculiar, winsome animated 2009 feature “The Fantastic Mr.