[igraph] tkplot with R 2.11.1 and igraph 0.5.4-1 and MacOS

[Pietro Terna]

   With R 2.11.1 and igraph 0.5.4-1 and MacOS, tkplot does not produce 
any output. The same example below runs in Win with R 2.8.1 and igraph 
0.5.1.

   Example:

library("igraph")
a0=matrix(c(0,0,3,1,0,2,1,10,0),nrow=3)
a=graph.adjacency(a0, mode="directed",weighted=TRUE)
alay=layout.circle(a)
tkplot(a, layout=alay)

   Best, Pietro Terna

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