[Dune] Commit rules on the release branch

[Andreas Dedner]

Acctualy this method was available in older versions of Dune and
somehow disapeared during some interface change.

Oliver Sander wrote:
> Dear Dune developers!
> I'd like to remind everyone that the 1.0 release branch is open
> for bugfixes only.
> 
> dune-grid revision 3458 received last night looks a lot more like
> a feature than a fix to me.  Therefore I would like to kindly ask
> the committer to reverse this patch.
> 
> Happy hacking,
> Oliver
> 
> 
> 
> ************************************************************************
> * Oliver Sander                ** email: sander at mi.fu-berlin.de        *
> * Freie Universität Berlin     ** phone: + 49 (30) 838 75217           *
> * Institut für Mathematik II   ** URL  : page.mi.fu-berlin.de/~sander  *
> * Arnimallee 6                 ** -------------------------------------*
> * 14195 Berlin, Germany        ** Member of MATHEON (www.matheon.de)   *
> ************************************************************************
> 
> 
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