IPv6 patch

[Marco d'Itri]

http://attila.bofh.it/~md/inn-20010301+IPv6-Md.diff.gz

I started adding IPv6 support to innd but now I need some help from
people who knows the guts of INN more than I do.
There are some FIXME comments in the diff, please check them.
The biggest problem is that innd will have to listen on more than one
socket (usually two) and rc.c and chan.c needs to be modified to allow
that.

What works:

- inndstart
- innd listening on one socket
- innxmit/inews/rnews

What is broken:

- innd opening his own listening socket (inndstart works)
- identd

TODO:

- nnrpd
- innfeed

-- 
ciao,
Marco