[cleanup] Remove not used includes and empty destructor

dumux/implicit/box/fvelementgeometry.hh

@@ -26,7 +26,6 @@
 
 #include <dune/geometry/referenceelements.hh>
 #include <dune/geometry/multilineargeometry.hh>
-#include <dune/grid/common/intersectioniterator.hh>
 #include <dune/localfunctions/lagrange/pqkfactory.hh>
 
 #include <dumux/common/parameters.hh>

dumux/implicit/cellcentered/fvelementgeometry.hh

@@ -26,7 +26,6 @@
 
 #include <dune/geometry/affinegeometry.hh>
 #include <dune/geometry/referenceelements.hh>
-#include <dune/grid/common/intersectioniterator.hh>
 
 #include <dumux/common/propertysystem.hh>
 

dumux/material/spatialparams/implicit1p.hh

@@ -70,9 +70,6 @@ public:
     ImplicitSpatialParamsOneP(const GridView &gridView)
     { }
 
-    ~ImplicitSpatialParamsOneP()
-    {}
-
     /*!
      * \brief Averages the intrinsic permeability (Scalar).
      * \param result averaged intrinsic permeability