Exclusions cannot have meta

[fgrunewald]

Describe the bug
It appears exclusions cannot have meta attributes directly after the interaction as is the case for other interactions. Instead of making the comment an interaction meta, it ends up in the node attribute dict which messes with node assignment.

Expected behavior

[ exclusions ]
1 2 {"comment": "this is an exclusion"}

The link above should have a comment in the interaction meta not the node attribute.

Workaround
Use the #meta syntax as shown below:

[ exclusions ]
#meta {"comment": "this is an exclusion"}
1 2

[pckroon]

We really really need to clean up the file format...