A state appeals panel on Tuesday used an opinion to call on the Illinois General Assembly to issue new sentencing guidelines for defendants between the ages of 18 and 20.The request from the 1st District Appellate Court panel came at the end of a 19-page opinion that upheld the 40-year sentence for a defendant who tried to kill someone less than three months after he turned 18.The 1st District panel found Cook County Circuit Judge Anna Helen Demacopoulos did not abuse her discretion when she sentenced defendant Deshawn …