[Dovecot] Namespaces

[Timo Sirainen]

0.99.11-test4 release: http://dovecot.procontrol.fi/test/

Finally namespaces somewhat working. Example:

namespace private {
  separator = /
  prefix = INBOX/
  location = maildir:~/Maildir
}

namespace private {
  separator = /
  prefix = #mbox/
  location = mbox:~/mail
}

Problems:

- Mailbox listing lists only the first namespace unless you clearly ask
mailboxes under some namespace. Not really a problem, but related to:
- There should be only one common subscriptions file for all namespaces.
This needs some thinking how to do it well.
- Having multiple different mailbox formats in one namespace still isn't
possible. Needs some more thinking as well.