Talk about your major deals. Mars, Inc. is set to buy the Wm. Wrigley Corporation for $22 billion. The deal is being fueled by some serious seed money from Warren Buffett's Berkshire Hathaway. The deal, which isn't inked yet, would signal a serious sea change in the snack food and candy market as prices for both sugar and milk are on the rise. It could also spur further consolidation within the confectionery industry, as Hershey......