[cleanup] replace std::pow(Scalar, int) with Dune::power(Scalar,int)
Remake of reverted merge request !2263 (merged)
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Include the Dune header for power @timjupe
Closes #880 (closed)
Edited by Kilian Weishaupt
Remake of reverted merge request !2263 (merged)
Closes #880 (closed)