public static void refreshUI () {
        synchronized (instance) {
            if (!instance.refreshScheduled) {
                instance.refreshScheduled = true;
                instance.eventRunner.perform(instance.refresh);
            }
        }
    }
strips a subset of HTML that tends to appear in descriptions generated
by Groundspeak Builder
main/src/main/java/cgeo/geocaching/wherigo/openwig/Engine.java