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Deprecate duck-typed constructor from Lagrange element

The constructor of the Lagrange element which is provided a vertex permutation previously accepted this in a duck-type fashion through a template parameter. The reimplementation by @oliver.sander internally works with std::array<unsigned int, dim + 1> which seems the correct call to me as well.

I therefore propose to fix this type in the interface, deprecating the old constructor. Most likely, only maintainers of discretization packages are affected by this change.

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