Switch to new dune-alugrid module

For 2.4, we will only support the new dune-alugrid module and remove support for ALUGrid 1.52.

That still needs to be done, though.

I'll put this on hold until #3 (closed) is resolved

Added ~26 label

mentioned in issue #1 (closed)

mentioned in merge request !5 (merged)

Status changed to closed by commit 97cc4626