[igraph] igraph_barabasi_game (dev version) producing duplicate edges

[Richard Geddes]

I just installed the dev version of igraph and produced some random
graphs using:

igraph_barabasi_game(&graph, n, m, NULL, true, IGRAPH_UNDIRECTED);

n = 100, 500, 1000, 5000, 10000, 50000, 100000
m = 5

and it consistently produces duplicate edges in the graph. 

I noticed that the released version of the library does not do this. 

Are duplicate edges allowed for this model?

Thanks
Richard