Add signal name in the python class.

This is crucial when debugging remotely using winpdb.

src/dynamic_graph/signal_base.py

@@ -164,6 +164,8 @@ class SignalBase (object) :
         else :
             raise RuntimeError(
                 "A pointer is required to create SignalBase object.")
+        self.name=self.getName()
+
     @property
     def time(self) :
         """