We're reorganising our external web servers, and had intended to make the change transparent to people on the outside, but publishing urls like
http://cm.bell-labs.com/sources/contrib/john/syscall.ps
confuses things. plan9 and cm are being pulled apart, so it would be
much better to publish the (currently equivalent) url
http://plan9.bell-labs.com/sources/contrib/john/syscall.ps
In general, plan 9 stuff will not be found under cm in future, and
vice versa.
