Revert "fixup dune-gdt includes"

This reverts commit e54a9d30a6af75efe1f222c5863e7a62229e6f92.
Merge branch 'dune-gdt-integration' of http://users.dune-project.org/repositories/projects/dune-multiscale into dune-gdt-integration
[femAlgorithm] respect settings whether to output vtk or not