ung.html is the main page of ung. If there is no default user, redirects to login.html
login.html : loads, asks or creates jio.json, then, create a storage - Storage.create(jio.json) - and redirects to ung.html (the user is saved in the localStorage);
ung.html : load the Page - Page.initialize(pageName) - and the storage - Storage.initialize();
Page : loads the content from xml files, display information about user when the storage is ready. Then, loads the editor and display documents information.