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!

examples/treeping64.py

@@ -0,0 +1,28 @@
+#!/usr/bin/python
+
+"Create a 64-node tree network, and test connectivity using ping."
+   
+from mininet import init, TreeNet, pingTestVerbose
+
+def treePing64():
+   results = {}
+   datapaths = [ 'kernel', 'user' ]
+   
+   print "*** Testing Mininet with kernel and user datapaths"
+   
+   for datapath in datapaths:
+      k = datapath == 'kernel'
+      network = TreeNet( depth=2, fanout=8, kernel=k )
+      result = network.run( pingTestVerbose )
+      results[ datapath ] = result
+   
+   print  
+   print "*** TreeNet ping results:"
+   for datapath in datapaths:
+      print "%s:" % datapath, results[ datapath ]
+   print
+   
+if __name__ == '__main__':
+   init()
+   treePing64()
+