[Dovecot] Smart IMAP proxying with imapc storage

[Timo Sirainen]

I just committed a very early initial implementation of "imapc" storage
backend to v2.1 hg: http://hg.dovecot.org/dovecot-2.1

You can't really do anything except open INBOX and read mails from it,
so it's currently only intended for initial testing. It sucks in many
ways right now, but I'll be improving it.

The idea is that you could set for example:

mail_location = imapc:imap.gmail.com

And then Dovecot could act as a proxy to gmail. It won't actually work
currently with gmail, because there's no SSL support for outgoing
connections.

Currently index files are forcibly disabled, but it would be easy to
enable them, allowing Dovecot to do caching locally to improve
performance. In future perhaps it will also support caching message
headers/bodies to avoid unnecessary traffic.

Besides the mail_location setting, you'll need to also forward the
user's password to imap process in "pass" userdb extra field. How to do
that depends on what passdb/userdb you're using. While testing you could
simply set a static password:

plugin {
  pass = yourpassword
}

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