add comments to explain that we need DEFAULT section params

tracim/command/database.py

         config_uri = parsed_args.config_file
         setup_logging(config_uri)
         settings = get_appsettings(config_uri)
+        # INFO - G.M - 2018-06-178 - We need to add info from [DEFAULT]
+        # section of config file in order to have both global and
+        # web app specific param.
         settings.update(settings.global_conf)
         self._create_schema(settings)
         self._populate_database(settings, add_test_data=parsed_args.test_data)