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
IMAP: add WITHIN search capability
IMAP: add LOGINDISABLED capability
include stdbool.h to help older GCC versions
cleanup config-file handling
cleanup compiler warnings
cleanup unused attributes
Revert "cleanup unused attributes"

This reverts commit d92a7160db8a3de073bd15408b7361117cf2f8a4.
LMTP: acknowledge delivery for all recipients
add infra-structure for automatic schema migrations
auto-migration for database schema
IMAP: finish up LOGINDISABLED