Allow user to restore database to default settings

Closes #90 (closed)

Add a backup DB, which is a duplicate of the working DB. Also add a pipeline to make sure that the backup DB is updated.

sohstationviewer/view/ui/main_ui.py

@@ -217,6 +217,12 @@ class UIMainWindow(object):
         """
         self.gps_plotter_action: Union[QAction, None] = None
 
+        """
+        restore_default_database: menu item to reset the database back to its
+            original condition
+        """
+        self.restore_default_database_action: Union[QAction, None] = None
+
         # ========================== Option Menu =======================
         """
         warn_big_file_sizes: option to check file sizes and give warning if
@@ -638,6 +644,11 @@ class UIMainWindow(object):
             'GPS Plotter', main_window)
         menu.addAction(self.gps_plotter_action)
 
+        self.restore_default_database_action = QAction(
+            'Reset Database to Default', main_window
+        )
+        menu.addAction(self.restore_default_database_action)
+
     def create_option_menu(self, main_window, menu):
         """
         Create Options Menu's Actions which help setting options for plotting.