Better instances for Treewidth

[thorehusfeldt]

The Treewidth lab needs some graphs with many vertices but low tree-width. There is a big library of such graphs at https://github.com/freetdi/CFGs/ , most of these have treewidth 1 or 2.
What would be really wonderful for this lab would be huge, natural instances of treewidth 5 to 10.

[llarisch]

If you still need such graphs: The CFGs repository now contains graphs with treewidth up to 8. I will create a repository for graph creation wrt to a treewidth upper bound within the next days.