time, support multiple statements in a single at statement (a personal
miracle of TCL programming!). So, you can do this:

	$ns at 40    "$queue0 set thresh_ 5 ; $queue0 set linterm_ 9"
	$ns at 40    "$queue0 set maxthresh_ 10 ; $queue0 set q_weight_ 0.5"
	$ns at 40    "$queue0 set queue-in-bytes_ 0"
	$ns at 40    "$queue0 set limit_ 50"

These are turned into LINK MODIFY events as such:

	QUEUE-IN-BYTES=
	LIMIT=
	MAXTHRESH=
	THRESH=
	LINTERM=
	Q_WEIGHT=

At present, they are turned into independent events; my TCL ability
falls way short of figuring that out! Easy as a perl script though!