Do a deep clone of this walker, including next and previous walkers. If the this AxesWalker is on the clone list, don't clone but return the already cloned version.
@param cloneOwner non-null reference to the cloned location path iterator to which this clone will be added.
@param cloneList non-null vector of sources in odd elements, and the corresponding clones in even vectors.
@return non-null clone, which may be a new clone, or may be a clone contained on the cloneList.
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