Implemented prompt method, changed signature
to match QuestionDialog2.__init__
Refactored existing code in User classes:
common __init__ code and User.callback pulled up to gen.user
Aligned gui and cli to use stderr for spinner and
progress printouts
For testability, self._fileout attr is used instead
of hardwired stderr/stdout, this is
add gui test (empty for now)
The new code (prompt) is not excercised anywhere but
in the unit tests yet, this is preparation work for other
items in bug #5598
svn: r22914
