On linking of arg group to claim, recalculate claims % and follow the changes up until it reaches the end

[DouglasUT2018]

Use dummy button to simulate linking of arg group for now. All arg groups can have button which, when pressed treats it like its just been added to the claim its already attached to.

[ijmccallum]

For the claim % - have a looksie at this issue: WikiLogic/Neo4JProcedures#3

I think it points to the algorithms repo too