ml_net is directed

[tseppelt]

Surprisingly,

> is.directed(ml_net)
[1] TRUE

I think m̀l_net shouldn't be directed. Please check.

[tseppelt]

c75eb16 added support for directed networks. Now, with default parameters, ml_net is treated as directed network which hence exhibits only directed motifs. This has the consequence that most examples in the vignettes don't work anymore as there based on undirected motifs. Two solutions:

• either treat ml_net as undirected network by setting directed = FALSE where appropriate
• or add another real-world example network, which is undirected, and rewrite the vignettes.

@marioangst how shall we handle this? You know ml_net best.

[marioangst]

made undirected, ok for illustrative purposes here. a59f280e4382d617cf8c7d3c5770aa836e8dfe83 #