Merge pull request #741 from alexjacks92/loggingAndTests

Tests now read both sets of logs.
added comments, minor refactoring as part of reviewing hash db code for memory leaks. No logic changes
Allow DS modules to supply sub-title of progress bar and updated RecentActivity to use it
Merge branch 'develop' of github.com:sleuthkit/autopsy into develop
Merge remote-tracking branch 'upstream/develop' into timingTest