If I am not allowed to create Things, the menu picks should be disabled

(Bug, Closed -> Fixed, Priority: Critical, Test Status: Functional tested , Reported By Bad Link: Thing 3y284oe not found, )
UX
Summary: Pointed out in email: even if I'm Anonymous, I can still click on Design a Model / Create a Thing, and get much of the way through the process before it fails.
These menu picks should be disabled if I don't have Who Can Create.