Cleanup of doc files.

Fixed xterm.py (and cleanup) to clean up screen sessions.
Cleaned up sshd.py (though interface is still in flux.)
Added 1024-node network example (treenet1024.py).
Added example showing multiple tests on a single network (multitest.py).
Renamed examples to make them easier to type!

cleanup

@@ -1,5 +1,12 @@
 #!/bin/bash
 
+# Unfortunately, Mininet and OpenFlow don't always clean up
+# properly after themselves. Until they do (or until cleanup
+# functionality is integrated into the python code), this
+# script may be used to get rid of unwanted garbage. It may
+# also get rid of "false positives", but hopefully nothing
+# irreplaceable!
+
 echo "Removing all links of the pattern foo-ethX"
 
 for f in `ip link show | egrep -o '(\w+-eth\w+)' ` ; do  
@@ -14,7 +21,7 @@ killall -9 controller ofprotocol ofdatapath ping 2> /dev/null
 echo "Removing excess kernel datapath processes"
 ps ax | egrep -o 'dp[0-9]+' | sed 's/dp/nl:/' | xargs -l1 echo dpctl deldp 
 
-echo "Removing vconn junk in /tmp"
+echo "Removing junk in /tmp"
 rm -f /tmp/vconn* /tmp/vlogs* /tmp/*.out /tmp/*.log
 
 echo "Removing old screen sessions"