Make adapt_grid work for Experimental::GridFunctionSpace
This MR adds some infrastructure to allow calling adapt_grid()
with a dune-functions-based GFS in a non-parallel context. It also modifies the test for that GFS to make sure that it works.
This MR adds some infrastructure to allow calling adapt_grid()
with a dune-functions-based GFS in a non-parallel context. It also modifies the test for that GFS to make sure that it works.