* Anti-procrastination feature (if you postpone a task too many times popup a dialog asking what to do)
* Use the start date field, and hide actions which have a start date in the future (probably requires an
  extra mode to take a look at those actions).
* Proper error handling
* Undo/redo support
* Add a count of the items in the Inbox for LibraryModel
* Allow filtering of the central view.
