Adding first ancestor node computation in reparent node command.
Adding first ancestor node computation in reparent node command.

d-tk/dtk,NicolasSchnitzler/dtk,rdebroiz/dtk,rdebroiz/dtk,NicolasSchnitzler/dtk,rdebroiz/dtk,d-tk/dtk,NicolasSchnitzler/dtk,NicolasSchnitzler/dtk,rdebroiz/dtk,d-tk/dtk,d-tk/dtk,d-tk/dtk,d-tk/dtk