Fixing Cathedral relations. TO FIX: add chapel to the right relation.
Ajout de la Cathédrale Saint Pierre d'après les plans de 1725.
Ajout des rues de 1720 à l'intérieur des remparts + dates approximatives
added more dates to towers and city walls
Added medieval towers. Added dates and names to most items. Improved river shape.
first draft for the city or Rennes: city walls, river and some buildings