Log Message:
Update to version 0.9.18.

Changes:

0.9.18:
=======

Upgrade release because of couple serious bugs in the 0.9.17.  Especially
backup router had stability problems with 0.9.17.  This was due to a rekey bug
when performing rekey with PFS, and because of another bug it caused the
backup (and other servers too) to crash.  If you are running a normal server
or backup router then ugprading is strongly recommended.  If you are running
any kind of server with PFS enabled in rekey, upgrading is recommended.

- Fixed protocol completion handling in connection closing.
- Fixed rekey with PFS to work on backup with disabled connections.
- Fixed CMODE command reply to return the user limit correctly.
- Fixed the watch notify to be called for resuming clients.

0.9.17:
=======
- Implemented the user limit to the CMODE_CHANGE notify and to the CMODE
  and JOIN command replies, as defined in the new protocol specs.
- Implemented the public key support to WATCH command, as defined in
  the new protocol specs.
- Added asynchronous connecting to remote router/server.
- Fixed the WHOIS public key deleting.
- Several other bugfixes were also made.