[Dune] Remark BartonNackman Interface Check.

[Andreas Dedner]

Prehaps a slightly more general name like
DUNE_TESTING or something, since there might be
other places where additional checks during testing
could be applied...

Robert Kloefkorn wrote:
> Hi Oli,
> 
> 
>>How about introducing a new preprocessor flag to switch the check?
>>That new flag would then only be set by the grid tests.  In my
>>opinion it is sufficient if the grid tests call the check.
> 
> 
> sounds great. Maybe something like DUNE_APPLY_INTERFACE_CHECK.
> 
> Cheers
> 
> R
>