[Dune] Parallel GridFactory

[Jö Fahlke]

Hi!

Is there a uniform way to create a parallel coarse grid using the GridFactory?

AFAICT ALUGrid requires vertex and element insertion on rank==0 only.  If
something is inserted on rank!=0 an exceptions is thrown.

In contrast, UGGrid appears to require insertion of the same vertices and
elements on all ranks, otherwise it will throw "GridError: Couldn't extract
grid boundary."

Thanks,
Jö.

-- 
Of all the things I've lost, I miss my mind the most.
-- Ozzy Osbourne
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