Resolve "Specify internal input/output dependencies of an Operation"

Closes #74 (closed)

b_asic/signal_flow_graph.py

@@ -403,4 +403,4 @@ class SFG(AbstractOperation):
                 if src.operation.depends(src.index, i):
                     if self._source_depends(port.signals[0].source, input_operation, visited):
                         return True
-        return False
\ No newline at end of file
+        return False