betweenness failure about bctpy HOT 4 CLOSED

I ran the betweenness_wei code up to that point with a sample matrix, and it looks like w is a float being used as an index. That's apparently not permitted, so it looks like we'll want to cast Q to a dtype like np.int64 or just cast w to an int.

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Does that binarization fix the original issue? I couldn't reproduce it with my sample matrices but I didn't any time to investigate it.

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I had been able to reproduce the error, and I didn't get it after the change. I also changed two other functions that seemed susceptible to the same issue: edge_betweenness_bin and edge_betweenness_wei. I didn't produce an error for either of those, but I verified that they ran without errors for me after the change. I'm still curious if this fixed problems for @dpisner453.

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I'm assuming its fixed in #52

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