Working on examples.

Added new example to create xterms.
Other minor changes.

examples/bigTreePing64.py

@@ -1,22 +1,21 @@
 #!/usr/bin/python
 
+"""Create a tree network of depth 4 and fanout 2, and 
+   test connectivity using pingTest."""
+   
 from mininet import init, TreeNet, iperfTest
 
 def bigTreePing64():
-   """Create a tree network of depth 4 and fanout 2, and 
-      test connectivity using pingTest."""
-
    results = {}
-   
+
    print "*** Testing Mininet with kernel and user datapath"
    
    for datapath in [ 'kernel', 'user' ]:
       k = datapath == 'kernel'
       results[ datapath ] = []
       for switchCount in range( 1, 4 ):
-         print "*** Creating Linear Network of size", switchCount
-         network = TreeNet( depth=4, fanout=2, kernel=k )
-         testResult = network.run( iperfTest )
+         network = TreeNet( depth=4, fanout=4, kernel=k )
+         testResult = network.run( pingTest )
          results[ datapath ] += testResult
          
    print "*** Test results:", results