[context] Please rename Context::cell to Context::element
Grid elements are called 'elements' consistently throughout Dune. Please do not deviate from this in the dune-pdelab
interface by using the word 'cell' for an element.
Grid elements are called 'elements' consistently throughout Dune. Please do not deviate from this in the dune-pdelab
interface by using the word 'cell' for an element.