Moving of bugs: The dialog always displays all todo lists known in the app

In the current version, when moving a todo, a flat list of todo lists is presented.

This makes it difficult to select the right one, especially when a user has multiple libraries.

This should be improved, either by having two drop downs (where the first is used to select the target library and the second the todo list) or by grouping the items according to library.

Update: Moving always happens within a library, so it makes no sense allowing the user to select the library. However, there is currently a bug so we display all todo lists, not just the ones in the library the todo is in.