* there seems to be a bug in dune-commons FloatCmp, so instead of testing
  against 0 we add 1 on both sides
* the basis functions are extremely sensitive to local coordinate
  distortions, so we obtain the (entity) local vertex coordinates from the
  reference elements instead of the entities geometry's local()

* ContinuousLagrangeSpaceBase -> Spaces::ContinuousLagrangeBase
* ContinuousLagrangeSpace::FemWrapper
  -> Spaces::ContinuousLagrange::FemBased
* ContinuousLagrangeSpace::FemLocalfunctionsWrapper
  -> Spaces::ContinuousLagrange::FemLocalfunctionsBased
* ContinuousLagrangeSpace::PdelabWrapper
  -> Spaces::ContinuousLagrange::PdelabBased
* DiscontinuousLagrangeSpace::FemLocalfunctionsWrapper
  -> Spaces::DiscontinuousLagrange::FemLocalfunctionsBased
* RaviartThomasSpace::FemLocalfunctionsWrapper
  -> Spaces::RaviartThomas::FemLocalfunctionsBased
* FiniteVolumeSpace::Default
  -> Spaces::FiniteVolume::Default

* DarcyReconstruction -> Darcy
* ReconstructionOperator::DiffusiveFlux
  -> Operators::DiffusiveFluxReconstruction
* ProjectionOperator::Lagrange -> Operators::LagrangeProjection
* ProjectionOperator::L2 ->Operators::L2Projection
* ProjectionOperator::Generic -> Operators::Projection
* ProjectionOperator::Dirichlet -> Operators::DirichletProjection
* ProlongationOperator::Lagrange -> Operators::LagrangeProlongation
* ProlongationOperator::L2 ->Operators::L2Prolongation
* ProlongationOperator::Generic -> Operators::Prolongation

* all traits are now in namespace internal
* added all variants of WeightedL2
* derived L2 from WeightedL2
* added over_integrate option

* otherwise the compiler can not select in case of 1d grids