Expectations can be a burden, and “Happy New Year” is heavy laden: director Farah Khan and leading man Shahrukh Khan (no relation) have made two prior features, 2004's “Main Hoon Na” and 2007's “Om Shanti Om,” that fall anywhere between “a lot of fun” and “all-time classic” depending on whom one asks, and there are plenty of people one can ask, as both films were enormously