[Dovecot] v2.1.17 released

http://dovecot.org/releases/2.1/dovecot-2.1.17.tar.gz http://dovecot.org/releases/2.1/dovecot-2.1.17.tar.gz.sig

Hopefully among the last v2.1.x releases.

    + zlib: Keep the last read mail uncompressed in a temporary file.
      This significantly improves performance when IMAP client does
      small partial fetches for a large mail.
    + acl: Optionally get default ACL's for private/shared namespaces
      from user's INBOX (plugin { acl_defaults_from_inbox = yes } 
    - Case-insensitive unicode character comparisons weren't all working
      as they should.
    - maildir: Fixed handling over 26 keywords in a mailbox.
    - auth: Don't crash in non-PLAIN/LOGIN auth mechanism if master user
      login is attempted without any master passdbs configured.