[Dovecot] Dovecot v2.0 wiki

I forked the wiki to

http://wiki1.dovecot.org/ is the old docs for v1.x http://wiki2.dovecot.org/ is the new docs for v2.0

For now wiki.dovecot.org points to wiki1, but once v2.0 is released I'll change it to point to wiki2. I symlinked the user directory, so users should stay synced between the wikis.

The main reason for wiki2 is to be able to describe Dovecot v2.0's actual behavior everywhere and get rid of all the old v1.x specific settings. The wiki1 is already annoyingly bloated and confusing with information about v1.0 and then v1.1 and maybe even how it's still different in v1.2..

Now would be a good time to do any other larger changes, if anyone has suggestions. :)

(Oh, and I haven't yet done any actual changes to wiki2..)