writable by adding a umask(0002) call.

1. The Linktest daemon, linktest.c, now listens for a KILL event. If received,
   the daemon will kill the linktest.pl child process and all of its subchildren.
2. The daemon also listens for SIGSTP events from the linktest.pl child, and
   will kill the linktest.pl process and its children if linktest.pl dies
   unexpectedly.
3. Locking has been implemented in linktest.c to ignore requests to start linktest
   while a current run is executing.
4. The controller script run_linktest.pl now includes the following new options:
   -t   allows the user to specify a timeout in seconds for Linktest.
   -v   prints out better feedback from the Linktest run as it proceeds.

Major remaining items are:
1. Avoid NFS mount hups
2. More testing, especially on vnodes

removal of unnecessary TEST option. Pending change: still need to move this to standard emulab style.

Last-minute tweaks to error ranges (wider latency tolerance due to occasional errors when running at low bandwidth, plus wider Pathrate tolerance to avoid false positives while waiting for tuning data).
Added more info when aborting run_linktest.pl
Added more time to prevent a race condition between collector startup and test during the loss and bandwidth tests.

Removed hardcoded "boss" from linktest.pl and run_linktest.pl
Changed historical log location.

Modified ltevent.c to use keyfiles.
Added a ROADMAP.
Linktest is now ready for first deploy.

better support for experiment failures (99% on latency and loss),
better error messages.

and wait for linktest events, and integrated it into the perl scripts.

At this point I'm working on small potatoes such as the rc.setup script
to invoke linktest daemon and nailing down where to put platform-specific
stuff such as the ns-linktest build and the customized tb-compat.

Also am testing linktest in cases where I've deliberately inserted an error
to make sure it catches it.

This includes an updated client-install.

However, this is not yet ready for builds due to certain libraries not
present on the nodes and ops. For those I will be writing a static
linked c program to handle the linktest "done" event in both linktest.pl
and run_linktest.pl.

and addded parameter passing the daemon.

Also fixed up the makefile for compilation and installation (client).

two-way assign). Has been tested on 5-node linux and bsd expts. Still chatty,
still does not log. Also does not yet incorporate changes from discussion
today, namely running ns on ops.