Forgot to add a check for whether event is actually boosted.
EventCachedPriorityObj has cached_priority field, not event.
Fixes a couple of bugs:
  1) Fixes a couple of basic name typos (misspellings, etc.)
     associated with promotion messages

  2) Had not actually been sending promotion messages because
     check in set_priority returns the wrong value.

  3) Added a warning message for what might be a bug.
It was really frustrating to deal with exception printouts in the
middle of debugging.  Added code to catch exception and ignore it
(rather than re-raise) if we already handled the exception in Waldo
code.
Minor misspelling bug.
Gets rid of irritating thread exceptions' being printed.
Merge remote-tracking branch 'origin/master'