IMAP: remove redundant logging during STORE
POP3/IMAP: simplify message accessors
IMAP: increase buffer size for dates in sql queries
IMAP: prevent assertion in sequence-set parser
IMAP: include user-id in login accepted log-message
IMAP: regression fix
IMAP: COPYUID cleanup
IMAP: add UIDPLUS capability
IMAP: small leak plugged