A Columbus-based calzone franchise is selling to a competing chain, a deal that will nearly double its footprint. D.P. Dough, which includes 26 restaurants today, was recently purchased by Calios, a competing 13-unit calzone chain. Existing Calios restaurants will be converted to D.P. Doughs in July as part of the deal. And Eric Cook, the new owner, plans to open additional D.P. Dough restaurants, according to a news release. Cook has already opened a new D.P. Dough in Kalmazoo, Michigan. He...