[#4299] ticket:293 Use ProjectUserCombo everywhere for tracker
[#4299] ticket:293 Use ProjectUserCombo everywhere for tracker

apache/allura,apache/incubator-allura,lym/allura-git,apache/incubator-allura,apache/incubator-allura,apache/allura,apache/allura,lym/allura-git,apache/allura,lym/allura-git,lym/allura-git,heiths/allura,apache/incubator-allura,apache/allura,lym/allura-git,heiths/allura,heiths/allura,heiths/allura,heiths/allura