[Nauty] The address for nauty mailing list

[Brendan McKay]

Please note that the address for posting to this list is nauty at anu.edu.au .

The older address nauty-list at cs.anu.edu.au is forwarded to nauty at anu.edu.au
but the mailing list software treats forwarded addresses with suspicion 
and it
can't be guaranteed to always work in the future.  So please use only
nauty at anu.edu.au from now on.

Thanks, Brendan.