Worked on page locking for simple editor (to avoid both editors working at the same time). Created MM.items.lock with ItemLock class, which is MM.PageEditor.PageLock class modified to work with Items, and adapted modify method to use it, and template to display message. The message displayed is always the same (it is not really locking anything). It seems the original one is also broken. Should investigate what happened with the old one. Tried to fix it by calling wikiutil.set_edit_lock on _writeLockFile method, but it raises an AccessError.
