Acknowledging that “these are not normal circumstances,” a federal judge Thursday denied a push by Cook County Jail detainees for release or transfer amid the coronavirus, but ordered Sheriff Thomas J. Dart to enact new policies to limit the spread of the virus behind bars.U.S. District Judge Matthew F. Kennelly approved a temporary restraining order that gives Dart through the end of the weekend to carry out a range of virus-prevention practices, but did not order him to move detainees to other forms of …