National Public Radio: Congressional investigators released documents this week showing that BP made a series of money-saving shortcuts and blunders that dramatically increased the danger of a destructive spill. In one document, an engineer described the well as a “nightmare” just six days before the April blowout. Rep. Henry Waxman (D-CA), chairman of the House Energy and Commerce Committee, says memos, e-mails and documents illustrate the risks BP took that lead to the disaster. “There were …