After removing the treetable changes, this is all that is left. I guess we co...

After removing the treetable changes, this is all that is left. I guess we could restructure the vendor files like core does to make it clear that this is not our code. Anyway, like @Berdir says, upgrading to 3.2.0 might fix most of the errors (and I see other fixes since 3.2.0 release as well). We are dealing with that in another issue anyway: #2737889: Upgrade to latest jquery treetable