We just missed London's Chocolate Week, and New York's seductive Chocolate Show was last month, so we're indulging now. Chocolates for the holiday season, then after that, for the winter chill in January, and after that for Valentine's Day, neatly tucked into February.  Frankly, any excuse will do.  From among Gotham's many boutiques, we've selected a few mouth-watering goodies.  And just because we're showing traditional bonbons here, don't think that you can't score thick, gooey brownies, all manner of interesting chocolate ice creams, and tasty, gourmet cocoas to brew at home.  Mmmm, good!