"The Time Traveler’s Wife," adapted from the 2003 best-seller by Audrey Niffenegger, is one of those gooey romantic mind-benders, like "Ghost" (which I adored) or "The Lake House" (not so much), in which a couple must come to grips with some trippy impediment to their relationship, such as life after death or a hole in the space-time continuum. Only instead of being milked for elaborate science-fiction thrills, the problem at hand gets treated as a weepy and grandiose inconvenience