* Implemented a workaround for the IMAP "expungebob bug." Specifically, since

* Implemented a workaround for the IMAP "expungebob bug."  Specifically, since
  we don't store the \Deleted flag persistently (and instead auto-expunge
  folders when they are de-selected) we were not advertising \Deleted as
  a PERMANENTFLAGS flag.  This was causing some clients (particularly
  Thunderbird) to misbehave -- they were simply electing not to transmit the
  flag at all.  As a workaround, \Deleted is now advertised as a
  PERMANENTFLAGS flag, even though it technically isn't.