You almost need a map to keep track of the reorganization now under way in the auto industry. Renault, the French auto maker, in is discussions to sell cars through GM’s Saturn dealers. Geely, the Chinese auto company, is bidding to buy GM’s Saab. This comes on the heels of Fiat’s investment in Chrysler and bid to buy GM’s European Opel brand. This week, Porsche and Volkswagen announced plans to merge. Even rivals BMW and Daimler are talking about ways to work together to cut costs.