* remove all references to $ip6sitelocal and output a warning
message if the variable is defined.
* introduce $ip6uniquelocal (defaults to 'NO') that will control the
behaviour of the system when $ip6mode is ``router'' (i.e. fc00::/7
will not be routed if the variable is ``NO'') as per RFC 4193.
Thanks to Jonathan A. Kollasch for pointing this out in PR 32152.