Clean up pulse.el a little

Clean up pulse.el a little

* lisp/cedet/pulse.el (pulse): Remove.
(pulse-momentary-timer): Save instead of the stop time.
(pulse-momentary-highlight-overlay): Call
pulse-momentary-unhighlight first thing. Treat
pulse-momentary-overlay as a single value, not a list. Save the
created timer. Only pass the stop time to the timer.
(pulse-tick): Update accordingly.
(pulse-momentary-unhighlight): Treat pulse-momentary-overlay as a
single value. Cancel the timer.