* Synchronize to Debian, only change left: s/exim4/postfix/ in the
  dependencies.
* debian/control: Use db4.3 until we switch over to 4.4 in a concerted
  effort.
* Add debian/patches/misc/patch-git-browse_get_namespace-overflow.diff:
  - Limit length of namespace received from IMAP server to avoid buffer
    overflow.
  - Patch taken from upstream git:
    http://dev.mutt.org/cgi-bin/gitweb.cgi?p=mutt/.git;a=commit;
      h=dc0272b749f0e2b102973b7ac43dbd3908507540
  - http://secunia.com/advisories/20810
  - (no CVE yet)