[Dune] AxisAlignedCubeGeometry's copy constructor

[Christoph Grüninger]

Hi Oliver,
I think the code at
   dune-geometry/dune/geometry/axisalignedcubegeometry.hh:126
is not what you intended. It looks like a non-viable hybrid of copy 
constructor and assign operator.

Bye
Christoph

-- 
Geography is just physics slowed down, with a couple of trees
stuck in it.         -- Terry Pratchett in The Last Continent