* Implemented all IMAP date-based search criteria. Note that Citadel does

* Implemented all IMAP date-based search criteria.  Note that Citadel does
  not record an "internal date" of a message, so the "sent date" and "internal
  date" searches perform identically.
* Date search comparisons available: "before," "on," or "on or after."  Yet
  another example of why Mark Crispin needs to be taken outside and shot.