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[YaspGrid] Do not precompute intersection geometries

Oliver Sander requested to merge yaspgrid-dont-precompute-intersections into master

This simplifies the code a bit. I have not measured the performance impact, but I believe that the new code will be faster if its speed changes at all. YaspGrid intersection geometries are simple objects, and constructing them on demand allows for more aggressive optimization.

As a side effect, this change makes the default constructor of YaspGridGeometry unnecessary. This is what motived this patch, see dune-geometry#25 (closed) for some information.

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