By: Mark Glennon* There’s no point in sugarcoating this. The financial crisis at the Chicago Public School District may come to a head this week, and the impact will extend beyond the school system. A CPS bond sale is scheduled for Tuesday, which is widely seen by financial markets as a test of whether it has a pulse. Here is a summary of key points from various sources: • CPS is just about out of cash, and its cash could be entirely wiped out on 48-hour notice, according to the Sun-Times. Specifically, the banks owed on $228