Jill Zarin, the most contentious of the “Real Housewives of New York City,” proved it really is all about her at the opening of the Limelight Marketplace the other night. Zarin went from booth to booth asking for free bies, says one spy, glomming fancy chocolates, T-shirts, brownies and even dog bis cuits. “It’s not like she can’t af ford to buy these things,” said one of the boutique owners. “She had such a sense of enti tlement, as if to say, ‘You need to give me things for free because I’m Jill Zarin’. “