Pitcher Carlos Marmol and the Chicago Cubs agreed Thursday to a one-year contract worth $2,125,000, the midpoint between the figures the sides exchanged in arbitration last month. In addition, Chicago reached a minor league contract with first baseman Kevin Millar. Marmol, a 27-year-old right-hander, was 2-4 with 15 saves in 19 chances and a 3.41 ERA in 79 relief appearances last year, taking over…