* AriaProcessor.scala: DEBUGGING PROCESS REPORTING; removed the RPC call from this class
* AriaProcess.scala: added 2 new properties: _gid & _isRestarting, as well as their setter/getter methods
* DbManager.scala: added queryTask(); in isTaskGIDUsed() the query should not include whether a task is completed or not, it should simply say that a GID should be unique across the table
* UpdateProgressJob.scala: in execute(), added a new method in the beginning to add Tail GID