Method append

src/common/classes/tree.h:268–279

	}

	void append(const BePlusTree& from)
	{
		// This is slow approach especially when used for assignment.
		// Optimize it when need arises.
		ConstAccessor accessor(&from);
		if (accessor.getFirst())
		{
			do {
				add(accessor.current());
			} while (accessor.getNext());
		}
	}

private:
	class NodeList;