CppAD: A C++ Algorithmic Differentiation Package  20130918

Use default copy constructor because they may be optimized better than the code below:

template <class Base>
inline AD<Base>::AD(const AD &x) 
{
     value_    = x.value_;
     tape_id_  = x.tape_id_;
     taddr_    = x.taddr_;

     return;
}
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