Merge relation/12400370 and relation/12400407

add Salerno/Campi flegréi train relationship

add relationship train between Campi flegréi and Salerno (aka line2)

Create a relation showing current line 6 to be opened (Uttara North – Agargaon)

lacks of vaporetti line 10

vaporetto line 7 is missing

Is the border line correct at Hakari border crossing bridge?

Line 4 of Qingdao subway to be here

Ajouter les master relationship pour les différentes lignes de banlieue d'Alger

relation/89793 :
make the relation stop at Rhäzüns ; add child Rhäzüns --> Schiers and Schiers--> Rhäzüns