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Draft: Do not require differentiable grid-functions in interpolate

Simon Praetorius requested to merge issue/do-not-require-differentiable-grid-functions-in-interpolate into master

This MR make the derivative(F) function optional for grid-functions passed to the interpolate() algorithm.

This solves an issue with dune-vtk grid-functions provided by the VtkReader: extensions/dune-vtk#7

Edited by Simon Praetorius

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