Bug in BarabasiAlbertGenerator

[<francisco.grimaldo AT uv.es>]

Hi all,

I think I have found a bug in the BarabasiAlbertGenerator class. 

When the number of links and nodes is increased (e.g. 200 nodes with
maxLinksPerStep=20), the generator raises several "Aieuu!" errors which 
finally
lead to an IndexOutOfBoundsException. I have been having a look to the source
code and the problem is in the first line of function "chooseAnotherNode". 
When
it says:
  int sumDeg = (edgesCount - degrees.get(index)) * 2;
It should say:
  int sumDeg = (edgesCount * 2)  - degrees.get(index);

Best,
Francisco Grimaldo