
This adds CONFIG_IP_NF_CUSEEME: support for the CuSeeMe messaging 
protocol. 

Unlike protocols like FTP or IRC, CuSeeMe doesn't open any
seemingly random ports for data transfers. It does, however, 
contain IP addresses of clients and server (reflector) inside the
packet payload, making it impossible to use with NAT
scenario's.

There is only a NAT module, ip_nat_cuseeme.o, and no 
connection tracking helper. 

By default, the helper module tracks UDP traffic over port 7648.

This helper has been tested in SNAT and DNAT setups. 

Note that this helper requires Brian J. Murrell's 
newnat-udp-helper.patch (submitted at 2.4.21-pre3 time)
