Changes since ZNC 0.204

Fixes:
* Identfile: don't crash when ZNC is shutting down.
* CTCPReplies setting with empty value now blocks those CTCP requests to the client.
* Show more sane error messages instead of "Error: Success".
* Imapauth: Follow RFC more closely.
* "No" is a false value too.

Minor stuff:
* Add Show command to identfile, which should help you to understand what's going on, if identfile is blocking every connection attempt for some reason.
* Make TLS certs valid for 10 years.
* Ask for port > 1024 in --makeconf.
* Reset JoinTries counter when we enable a channel.