Build 0006

- Improved exception catching in
MainFrame.DeleteDateRangeWorker.doInBackground() and
MainFrame.DeleteAllEvents.doInBackground()
- Removed unnecessary method pstSearch() from PSTSearchFrame
- Multiple updates to comments
- If the user does not have permission to read the .pst file, a warning
is displayed and execution halts

- Bug fix: Running delete all events after a sync was not removing the
label reporting the number of events before and after the sync
- Bug fix: If the there was no internet connection at the being of
execution, the user would be prompted to enter their credentials as if
authentication had failed.