Cook County Sheriff Thomas J. Dart, who has long complained that drastic cuts to mental health programs have turned jails into dumping grounds for the mentally ill, has named a clinical psychologist Tuesday to run Cook County Jail that is one of the largest in the nation.The American Jails Association said it knows of no other jail in the United States being headed by someone with the background of Dr. Nneka Jones Tapia.As many as 35 percent of the jail’s inmates suffer from serious mental illness, Dart said. He said …