Graphs

> Ok, so I will be able to use "attributes" for a good rendering with the laggered tree layout.
>
> Well, I did not know that, that's why I've created a new class which is now called ROCompactTreeNode (or something like that), but maybe it's not useful to keep it, just a little refactor of the algorithms, and it will works with regular ROElement.
>
> Igor told us, that the problem was due to the fact that we keep visualizations open, while quitting our image, and that when launching it athens try to draw on a surface (external to pharo) that does not exist any more. Updating to 2.1 solve the problem, we have an error instead of an exit.
>
> Regards
>
> Mathieu
>
>  
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