[Ns-announce] anonymous cvs access to ns turned off

[John Heidemann]

Anonymous cvs access to ns-2 and related programs has been disabled
due to security concerns.

For now, users who need up-to-date versions of ns should use the daily
snapshots described on the "download ns" web page.

We would like to restore anonymous cvs access but will not do so until
we have confidence in its security.

   -John Heidemann