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[fix] Correct application of Piola transform to derivatives

Jakub Both requested to merge fix-piola-transform into master

The Piola transform applies the transposed of the Jacobian (among other operations). In the previous version, the plain Jacobian has been applied for sets of derivatives. This has been fixed.

FYI: With the current fix the example also runs for simplicial grids (not implemented in this merge request). If wished, I can enhance with the possibilty of using a simplicial grid.

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