Performed de-duplication of the progress data and stats data (i.e. current file processed size was available in both progress data and stats data and not always updated simultaneously). There is no separate progress data anymore - everything is now placed in the stats data. (CH-124)
Added support for successfully loading corrupted task files (now loading such task does not force CH to exit - instead an error is logged (if possible) and task is marked appropriately in the status dialog) (CH-59)