Save a tiny bit of time: self.tk.call takes a tuple argument so it's

Save a tiny bit of time: self.tk.call takes a tuple argument so it's
not needed to say apply(self.tk.call, t); self.tk.call(t) has the same
effect.  This cuts down tremendously on the number of apply() calls
made.  No measurable effect, but at the very least it saves the lookup
of apply() in the globals!