Poitiers problem

[IhateTrains]

frankish loc of c_bourbon is "Poitiers", but c_poitiers exists too. To make things worse, capital block of d_aquitanica says

capital = 145 # Poitiers

but province 145 is La Marche 🤔

@loup99 you're probably the best team member to ask about the region, could you look at it after the HF merge?