Comment 1 for bug 638174

Since we already have weighted edge-betweenness calculation, it should not be too hard. The only problem is that edge.betweenness community does not call edge.betweenness, but does the calculation itself, because of performance reasons.

But it could be easily rewritten to call an internal version of edge.betweenness.community, that does not require the reallocation of memory all the time.