ConAgra Foods is no stranger to deal wrangling. For much of its history, the Omaha-based food giant was run as a holding company, snapping up new pieces and brands to add to its diverse operations that spanned the entire food chain. Beef and pork production in one corner, commodity trading and buying in another, and packaged and commercial foods each operating separately — each with its own team of sales, financial, marketing and back office staffs to make things tick. Things are different now. Much different....