[Dune] [#875] Loss of 5% performance in GeometryGrid

[Dune]

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FS#875 - Loss of 5% performance in GeometryGrid
User who did this - Carsten Gräser (Carsten)

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While a shared_ptr could be used to do the reference counting, it might introduce another issue:
If the geometries are allocated dynamically using an allocator you must also provide a deleter to the shared_ptr introducing another a 'new' for the internal type erasure. For this reason allocator support will be added to the shared_ptr in c++0x.
If we try to use a shared_ptr here we should compare std::shared_ptr and boost::shared_ptr (with allocator) with std::tr1::shared_ptr (without allocator). If we need the allocator support we could reimplement it in dune and use either std::... boost::... or dune::... but not std::tr1.
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