[Dovecot] Per-user flags/indexes for shared mailboxes

[Timo Sirainen]

The attached patch adds support for doing e.g.:

namespace {
  type = public
  prefix = Public/
  location = mdbox:/var/lib/public/mdbox:INDEXPVT=~/mdbox/public
  list = yes
}

So the private flags are stored in indexes under ~/mdbox/public/, while
the shared flags are stored under /var/lib/public/mdbox/. The patch
currently hardcodes the shared flags as only MAIL_SEEN. I'm not really
sure what would be the best place to configure which flags are private.
Perhaps a per-namespace default, but how to configure it per-mailbox?

Also per-user keywords aren't currently supported. And it's a little bit
annoying that each private flag update must increase the shared modseq
for the message, but that can't really be helped. (Alternative would be
for each user to have their own private modseqs, which could get
difficult.)

I'll probably commit this to v2.1 after some more testing.
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