[Dovecot] Mercurial repository

I removed "dovecot" repository for now. It was almost the same as dovecot-1.1, with the exception that I had forgotten to commit a few things there and also messed up some other commits ("oh, hg export can export multiple changesets at a time, cool. oh, hg import imported it all in one changeset, not cool.").

So for now v1.2 code doesn't exist. I'll clone it again from dovecot-1.1 once I have something real to commit. Although I guess that's probably going to be pretty soon.