I should be able to Undelete a deleted Thing

(User Story, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Justin du Coeur, )
History, UX
Summary: Now that we have History, there's no excuse not to have this feature front-and-center.
Currently, we have a big nasty "Are you sure?!?!?" confirmation box when you try to delete something. That's lousy UX. Instead, the "Thing deleted" message that shows up after deletion should include a clickable link to restore the deleted Thing; if you click it, it restores it from History, and takes you to that Thing.
This same functionality should be available as a button on Delete entries in the History View.
This probably requires a new command to SpaceCore, but it does not require a new event -- the existing DHCreateThing probably works fine. (Possibly with a "restored" flag added.) We would still need to check the Properties (which might now be illegal), and the Link Name might possibly have to change (if something else with the same Link Name was created in the meantime), but it should be able to follow mostly the same code paths we already have.