Some feedback from chx over IRC

Talking with chx on IRC regarding the issue => Updates run in unpredictable order => Drupal, update system, normal, active, 3 IRC mentions

chx has written some testing on DFS in the drupal sandbox. The nice answer "noone stops you from taking the weights.php from my sandbox and run with it." and these comforting words I guess I have to 'go for it'.

But I first needs some 'steps to reproduce' the issue.

- paragraph 'Topological Sorting'