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- Do not scale the density functions  with the thickness to avoid confusion
  since some densities need to be scaled and some do not need to be scaled
  with the thickness depending on the dimension of the grid, their direction
  and their kind (Neumann or volume load).

- Fix bug in the `RealTuple::log` method: Calling `log(a,b)`returned `a-b`
  instead of `b-a`.

- Fix the return value of `ProductManifold::log`: It was `TangentVector`,
  but now it is `EmbeddedTangentVector`.

- The `RigidBodyMotion` class has a `log` method now.

- The method `Rotation<3>::log` now returns an `EmbeddedTangentVector`
  instead of a `SkewMatrix`.  This is consistent with the other manifold
  implementations.

- Deprecate the method `RigidBodyMotion::difference`; the method
  `RigidBodyMotion::log`.  Watch out: The `difference` method was buggy!
  See https://gitlab.mn.tu-dresden.de/osander/dune-gfe/-/merge_requests/2
  for details.