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* Added HTML santizing to the alert class, so bad HTML is stripped as part of
   processing.
 * Alert#cleared? now means "not raised"
 * Better error handling in the Timer class, making sure that the timer never
   gets permanently frozen.
 * Moved notification and packet buffers to the Server class, meaning that if
   the Processor or Notifier threads crash, we don't lose all the items waiting
   to be processed/notified.
 * XMPP/Email Alerts now use templates, instead of instance methods.
 * Emails now get sent as multipart with HTML to allow detail fields to be
   shown as nature intended.
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