"I appeal to history," protested Napoleon Bonaparte as he was shipped off to final exile on St. Helena. History's ultimate judgment is still out on the diminutive Corsican, but I submit that from a culinary standpoint he deserves our gratitude. That's because were it not for Napoleon one of the world's greatest indulgences might never have been invented. I'm referring to Nutella , that remarkable chocolate and hazelnut spread that In Europe it's considered not just a food but, as one of the