Improve datastore about cached trip details

web/traveldrafter.js

@@ -2,8 +2,10 @@ import * as Api from './api.js';
 import { setupPopups } from "./popup.js";
 import { setupLocationsSearch } from './locations-search.js';
 import { setupJourneysSearch, attachJourneysSearch } from './journeys-search.js';
+import { DataStore } from './datastore.js';
 
 window.Api = Api;
+window.DataStore = DataStore;
 
 setupPopups();
 setupLocationsSearch();