[igraph] high-'power' bug (?) in barabasi.game

[jabrunso]

I am trying to construct graphs using barabasi.game that form a single  
connected component, which i thought from the construction algorithm  
would be automatic. However, some examples have been disconnected.

Playing with the parameters suggests that the problem only occurs when  
my 'power' values are high, but i don't see why this should be a  
problem. In each case the graph becomes a pair of stars with one loop  
at one of the hubs. Here are some examples:

> g <- barabasi.game(n = 32, power = 125, m = 1)
> is.connected(g)
[1] TRUE
> g <- barabasi.game(n = 32, power = 250, m = 1)
> is.connected(g)
[1] FALSE
> g <- barabasi.game(n = 16, power = 250, m = 1)
> is.connected(g)
[1] TRUE
> g <- barabasi.game(n = 16, power = 500, m = 1)
> is.connected(g)
[1] FALSE

Thanks for any help!

Cory