Another not-great day for the auto industry has passed, and its ramifications will echo for some time.  A whole lot of Nissan employees are about to lose their jobs, and one man who became a face of GM is preparing to step down. We'll start with the development that might, for lack of details, be quicker to cover.  Because sales are down and so that it can save money, Nissan intends to cut 20,000 jobs, or about 9 percent of its ...