By RICARDO CASTILLO     By shutting off the ducts carrying fuel from the state-owned Petróleos Mexicanos (Pemex) in order to stop robbery, Mexican President Andrés Manuel López Obrador (AMLO) opened up a Pandora’s box. His problem is now how to shut it closed again. AMLO’s open declaration of war against huachicol (pronounce wa-chee-kol), or fuel theft, is, 17 days since it