Could this paper products giant end up on the block?Consolidation is heating up in the paper and packaging industry, and speculation is building that International Paper (IP 0.41%) could be among the targets for a deal.Shares of IP gained 29% in May, according to data provided by S&P Global Market Intelligence, on investor hopes that a big offer could be in the company's future.IP as a buyer, and a seller?Paper and packaging remain in demand even in a digital world, and the industry has seen a number of dea ...