[Dune] dgfgridtype.hh confuses me

[Christoph Grüninger]

Dear Dune,
my colleague stumbled over a documentation flaw. I investigated the 
situation and got confused by /dune/grid/io/file/dgfparserdgfgridtype.hh

===
#ifndef DUNE_DGFGRIDTYPE_HH
#define DUNE_DGFGRIDTYPE_HH

#warning "<dune/grid/io/file/dgfgridtype.hh> has been deprecated."
#warning "It suffices to include config.h."

#include <dune/grid/utility/gridtype.hh>

#endif
===

Either it is sufficient to include config.h and we can drop the 
inclusion of gridtype.hh or it is not and the warning is not right. 
What's the case?

Thanks
Christoph

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