WASHINGTON — What began as an investigation of peanut butter shipped to U.S. nursing homes and cafeterias has broadened with the Kellogg Co. recalling 16 products and federal officials confirming salmonella contamination at a Georgia facility that ships peanut products to 85 food companies. A nationwide salmonella outbreak has sickened hundreds of people in 43 U.S. states and killed at least six.Late Friday, Kellogg said in a statement it was recalling its Keebler crackers and other products voluntarily in light of problems discovered in Georgia."The actions we are taking today are in keeping