Allow copying of AbstractVolume
The copy constructor was deleted, but I don't really see a reason why. I ran into this during the ATLAS Calo construction, and unless there's a good reason why they shouldn't be copyable, I think we should make them.
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The copy constructor was deleted, but I don't really see a reason why. I ran into this during the ATLAS Calo construction, and unless there's a good reason why they shouldn't be copyable, I think we should make them.