Independent: The university town of Marburg is where the Brothers Grimm collected many of their fairy tales, and the cobbled streets and medieval buildings look like they could have come straight out of one of their illustrated children’s books. Now, following the approval of a new law, the quaint red-tiled roofs may soon have to be adorned with solar panels and the usually genteel residents are up in arms. From October this year it will be mandatory for solar panels to be installed on new …