Moving on isn’t easy, and Nicole Holofcener, writer and director of “Enough Said,” doesn’t let us forget it in her story of middle-aged love. Holofcener manages to create a romantic comedy that is at once intelligent, moving and fiercely funny, a rarity in a genre recently dominated by forgettable, formulaic plotlines. “Enough Said” is not escapist entertainment: the fairy-tale love affairs of quirky twenty-somethings have no place in Holofcener’s film. Rather, the characters and their difficulties are refreshingly relatable, even for the college-aged viewer.