Added flux calculation which is independent of cartesian grids (should work on triangular grids)
Added flux calculation which is independent of cartesian grids (should work on triangular grids)

atgeirr/equelle,atgeirr/equelle,sintefmath/equelle,babrodtk/equelle,sintefmath/equelle,sintefmath/equelle,babrodtk/equelle,atgeirr/equelle,sintefmath/equelle,babrodtk/equelle,sintefmath/equelle,atgeirr/equelle,atgeirr/equelle,atgeirr/equelle,atgeirr/equelle,babrodtk/equelle,babrodtk/equelle,babrodtk/equelle,sintefmath/equelle,sintefmath/equelle,babrodtk/equelle,sintefmath/equelle,atgeirr/equelle