If you’ve never had a lousy boss, consider yourself lucky. The sad fact is that at some point in our professional lives, most of us — military and civilian alike — will encounter a superior who is an absolute pain to deal with. Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, is taking aim at so-called “toxic leaders” by encouraging each of the services to adopt 360-degree evaluations, a process in which commanders are reviewed by their peers and subordinates in addition to the officers who oversee them. The objective is to identify bad apples early, before they’re…