[Dune] Entities in dune-alugrid are not default constructible

[Steffen Müthing]

Dear ALUGrid developers,

I’ve just noticed that at least the ALU2dGridEntity<0, 2,…> is not default constructible in the current master
of dune-alugrid. Is that a known issue? Entities and intersections should be default constructible since 2.4,
and PDELab now relies on this fact in a number of places, making it impossible to use dune-alugrid with
PDELab right now...

Thanks for your help!

Best,

Steffen

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