boundary fix for sha512 passwords #1040
Fix auth cancellation patch

Check command input buffer instead of the last command argument.
Fix next argument index value.
support wrapped boundaries during reconstruction
IMAP: EOF on stdin is not an error
remove unused file
IMAP: land QRESYNC (rfc5162) capability
POP3: fix segfault; fixes bug #1043
LMTP/TIMSIEVE: fix possible segfaults
IMAP: fix inverted logic during abort
fix regression in utf7 mailbox matching
Fixed wrong result check in change username function.
IMAP: add loop protection to cleanup callback
fix some minor typos
Fixed critical spinlock when appending empty string
fixed copyright and old version info on schema files
add helper script to dump backtrace on busy threads
update documentation of purging and deletion switches of dbmail-util
close a significant leak from disconnecting clients
Revert "close a significant leak from disconnecting clients"

This reverts commit 637751051e2d4d96fcdc58c6b43995bec280cea2.
generalise dumpbt.sh script