Write a status file during waf build step

examples/tutorial/wscript

@@ -6,6 +6,8 @@ def build(bld):
         
     obj = bld.create_ns3_program('first', ['core', 'point-to-point', 'internet', 'applications'])
     obj.source = 'first.cc'
+
+    bld.register_ns3_script('first.py', ['core', 'point-to-point', 'internet', 'applications'])
         
     obj = bld.create_ns3_program('second', ['core', 'point-to-point', 'csma', 'internet', 'applications'])
     obj.source = 'second.cc'