Misc bug fixes

Fixes:
* Keyword Search showing wrong number of results when there are no results
* Media Tab path label not resetting on 64 bit
* Cleanup of firefox getDownloads methods
* Browser data reporting on end of ingest.

New:
* Removed duplicate columns from Keyword Search Results
* Added MAC time to Keyword hit results
* Fixed a Null Pointer Exception if the Keyword Results DRV is closed before the query finishes running.