add TraceResolver::PrintAvailable method

utils/wscript

@@ -16,3 +16,7 @@ def build(bld):
 
     obj = bld.create_ns3_program('replay-simulation', ['simulator'])
     obj.source = 'replay-simulation.cc'
+
+    obj = bld.create_ns3_program('print-trace-sources',
+                                 ['internet-node', 'csma-cd', 'point-to-point'])
+    obj.source = 'print-trace-sources.cc'