Panthers place Martin on IR, promote three practice squaders

‘Tis the season for stashing players for the future on the 53-man roster. The Panthers announced they had promoted two of their own practice squaders, and signed defensive end Mario Addison from the Redskins practice squad. The back-filling came after they placed safety Sherrod Martin (knee) and defensive end Antwan Applewhite (hamstring) on injured reserve,…