Add copy/paste to add relationship dialog

[DillonJ]

My use case is that I am creating a unit__node__node relationhsip and have already typed it one way I'd like to be able to copy and paste to create it the other way

[soininen]

Would Manage relationships dialog work for your use case? It creates all possible combinations of selected objects.

[DillonJ]

Hi Antti - yes it probably would have made more sense here.

I'm thinking all dialogs should support copy paste - I think the user would be expecting that

[soininen]

I agree with paste support. I just implemented it in Alternative and Scenario trees but many other docks don't support it yet.