Hi, I ran across a bug in the graph.average_distance() function.  It 
appears to ignore the by_weight parameter and defaults to False, even if 
the edge labels are weights.  

The segment of code that produced the error:

# These incorrectly give the same value
realG.average_distance(by_weight = False)
realG.average_distance(by_weight = True)

# calculating from the wiener index correctly gives two different values
2*realG.wiener_index(by_weight=False)/(realG.order()*(realG.order()-1))
2*realG.wiener_index(by_weight=True)/(realG.order()*(realG.order()-1))

Thank you!

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