IMAP: use raw headers instead of gmime parsed ones during bodystructure commands
test and fix p_list_length for empty lists
LMTP: fix MAIL FROM regression
SIEVE: fix mempool regression
small fix on imap load-tester
update List_T unit-tests
IMAP: lower loglevel when CREATE tries to add existing mailbox
IMAP: fix socket write regression
document backlog parameter, and increase the default
LMTP: speedup during delivery

avoid loading the full mailbox state
IMAP: reload mailbox only if modified; #1010
IMAP: rfc compliance testing
IMAP: fix in search
add missing va_end calls

Signed-off-by: Paul J Stevens <paul@nfg.nl>
IMAP: plug potential leak
use api
make printf of long ints portable
fix ssl regression

Signed-off-by: Paul J Stevens <paul@nfg.nl>
IMAP: remove unused idle_status option
IMAP: replace GMutex with pthread_mutex_t; #990