Work in progress
- Working on "2nd order heat equation". seems to work for internal
faces. need to include boundary faces
Added skeleton of AllCellsRange class
Merge branch 'cartesian' of https://github.com/sintefmath/equelle into
cartesian

Conflicts:
	experimental/cartesian/include/equelle/CartesianGrid.hpp
	experimental/cartesian/src/cartesian_test.cpp