[igraph] broken cluster.distribution in R 3.0.0

[Bob Pap]

Dear Gábor and Tamás,

The implementation of cluster.distribution is broken in R 3.0.0. The reason is a changed hist():

Prior to R 3.0.0 there was a component intensities, the same as density, for long-term back compatibility.

a small change in code is needed in the definition of cluster.distribution intensities -> density

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Kindly,

Bob Pap