By: Mark Glennon*   If you haven’t followed Puerto Rico’s financial crisis, serious debate now focuses on authorizing it to file a “Super Chapter 9” municipal bankruptcy. As a territory, Puerto Rico currently cannot file under the Bankruptcy Code. That can be changed easily by Congress with the President’s signature, however. They can also change Chapter 9 of the Bankruptcy Code to make it a faster, firmer and more predictable route to a robust recovery.   And the Bankruptcy Code, it’s widely accepted, trumps state limitations on impairing pension obligations. Federal power to make and change bankruptcy law is