[Dune] localFiniteElement for C1

[Oliver Sander]

Hi Carsten,
> All this aside, I know that Maren-Wanda Wolf and Tobias Kies,
> both here at FU Berlin, have implemented the Morley-element
> (nonconforming C1, triangles) and the Bogner-Fox-Schmidt-element
> (conforming C1, quadrilaterals), respectively. However,
> both implementations are experimental, because the
> former hacks around a) and b), whereas the latter is
> tied to YaspGrid using knowledge on its implemen-
> tation-defined element orientations.
can you maybe post the code somewhere, so people can use it for guidance.
Also, seeing the code may allow others to understand better exactly how
you had to hack your way around the interface shortcomings.

Best,
Oliver

>
> The main reason for those shortcomings, is that we never
> really discussed the needs of FEs with higher order regularity
> requirements. Please notice that there is significant progress
> on c) going on in the dune-functions module. I also hope, that
> we can discuss this on the upcoming developer meeting.
>
> Best,
> Carsten
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