Tell the user to cancel the extraction first if they try to exit while it's in progress.

main_window.py

@@ -170,6 +170,7 @@ class MainWindow( QMainWindow ) :
         if type(widget) is StartupWidget :
             # don't allow this if we are analyzing files
             if widget.analyze_thread :
+                MainWindow.show_info_msg( "Please cancel the analysis first." )
                 QApplication.beep()
                 evt.ignore()
                 return

startup_widget.py

@@ -289,7 +289,7 @@ class StartupWidget( QWidget ) :
         """Load the database and start the main application."""
         fname = self.le_load_db_fname.text().strip()
         if not fname :
-            MainWindow.show_error_msg( "Please choose a database to load." )
+            MainWindow.show_error_msg( "Please choose a database to open." )
             self.le_load_db_fname.setFocus()
             return
         if not os.path.isfile( fname ) :