Issue 3047: REFACTOR: Added intention revealing helper method to AppRegistry class>>register:

http://code.google.com/p/pharo/issues/detail?id=3047
Old:
register: aProviderClass
...
        default := nil.  "so it'll ask for a new default..."
...

New:
...
        self askForNewDefaultOnNextRequest.
...

Fix in inbox: System-Applications-SeanDeNigris.15