[Dune] [#220] Is it safe to call method father()?

[Dune]

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FS#220 - Is it safe to call method father()?
User who did this - Andreas Dedner (dedner)

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"Not invasive" is often used here as a ''kill it all'' argument.
If a method is logical (I am trying to obtain an EntityPointer so
something which might not be there) and nicely consistent (the same
situation in the Intersections uses the same mechanism) then let us
implement this method. There seems little difference for a grid 
maintainer to add a method 
bool hasFather() const { return level()>0); }
to the entity compared to having to go into the father method
and add
if (level()==0) throw exception
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