* 'master' of git.distorted.org.uk:~mdw/publish/public-git/zone:
addr-family-ipv6.lisp (ipaddr-string): Ignore trivial runs of zeros.
addr-family-ipv6.lisp (ipaddr-string): Use IPv4 notation if appropriate.
addr-family-ipv6.lisp (ipaddr-string): Upend the conditional.