[Dune] Grid geometry and storage

[Christoph Grüninger]

Hi Timo,
there is an somewhat related issue:
https://gitlab.dune-project.org/flyspray/FS/issues/1550
I don't know what happened to it as Dune 2.4 was
already released.

Bye
Christoph

-- 
On the one hand [computer "science"] has components
of the purest of mathematics and on the other hand
of the dirtiest of engineering. -- A. Oettinger 1967