IMAP: fix BODY fetch regression
IMAP: BODY fetch expand test coverage
IMAP: envelope cleanup
add systemd support

This patch adds .service files and tmpfiles.d.

Signed-off-by: Paul J Stevens <paul@nfg.nl>
add --sieve switch for mbox import

Signed-off-by: Paul J Stevens <paul@nfg.nl>
systemd: add generated files
handle regression after coverity fixes
IMAP: avoid gmimestream in send_data

because filtered gmimestreams don't support SEEK_* :-(
lock the selfpipe to avoid spin-lock
IMAP: replace self-pipe event with a timeout event
IMAP: reduce the heartbeat speed
IMAP: reduce reachables
remove redundant memory copying
memory pool for integer allocation
Use proper id in oracle blob comparison prep statement
fix small test-regression
IMAP: use socket events to drain the message queue more often
IMAP: fix base-subject scanners for empty base-subjects