[igraph] Diffusion Centrality

[Thomas]

I don't suppose anyone on here has or is planning to implement the  
diffusion centrality measure as described in the section "An  
approximation of communication centrality" in:

http://www.sciencemag.org/content/341/6144/1236498.full.pdf

(Before someone suggests it, my coding skills are too shaky to attempt  
this except as a last resort, although I have implemented a metric  
that attempts to measure a similar concept, details at: http://papers.ssrn.com/sol3/papers.cfm?abstract_id=2289732)

Thank you,

Thomas Chesney
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