SPRINGFIELD — Lawyers for thousands of mentally ill prisoners are claiming the state must do more to fix a treatment system they have called “a moral and legal catastrophe.”The group this morning filed a motion in federal court for the Central District of Illinois to enforce an agreement to provide better treatment to about 12,000 prisoners with mental health issues.A court-appointed monitor earlier this year found the state’s Department of Corrections to be out of compliance with the 2015 agreement …