[examples] Add examples with Hermite-type bases

Carsten Gräserrequested to merge
feature/hermite-examples into master

This adds three examples:

  • 2d Poisson equation with cubic Hermite-basis and weak enforcement of Dirichlet BC (Nitsches method).
  • 2d Poisson equation with cubic Hermite-basis and strong enforcement of Dirichlet BC utilizing the FunctionalDescriptor interface.
  • 2d biharmonic equation with nonconforming Morley basis and strong enforcement of clamped BC utilizing the FunctionalDescriptor interface.

Merge request reports