Notify user, make backup during hashdb config file format update

Added code to the HashDbManager class to make a back up copy of old format/schema hash database configuration files. A message box is displayed to the user to let the user know the back up has occurred and where the back up file is located.
Merge pull request #392 from rcordovano/hashdb_config_update_backup

Notify user, make backup during hashdb config file format update