Fix Emulab portal NSF award number.

The previous value was based on the University account number.

www/aptui/portal_defs.php

@@ -51,7 +51,7 @@ $WITHPUBLISHING = 0;
 $PORTAL_MANUAL          = "http://docs.emulab.net";
 $PORTAL_HELPFORUM       = "emulab-users";
 $PORTAL_PASSWORD_HELP   = "Emulab Username or Email";
-$PORTAL_NSFNUMBER       = "CNS-58502134";
+$PORTAL_NSFNUMBER       = "1513121";
 $PORTAL_GENESIS         = "emulab";
 $DEFAULT_AGGREGATE      = "Emulab";
 $DEFAULT_AGGREGATE_URN	= "urn:publicid:IDN+${OURDOMAIN}+authority+cm";