[Dune] Using absolute path to a mesh file

[Aleksejs Fomins]

Dear Dune,

Now when the tests are built out of source, I feel I should use the
absolute path to mesh files for testing dune-curvilineargrid, same as it
is done in dune-grid.

I notice that in dune-grid it is done by using the variable

DUNE_GRID_EXAMPLE_GRIDS_PATH

However, I cannot find where this variable is defined using grep on
dune-grid. Could you please teach me how to define such a variable?

Regards,
Aleksejs

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