2015-05-25 Hartmut created for walking through a file tree but with universal approach.
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Checks whether the name matches.
It returns null if the name does not match.
It returns this if the name matches with this.
It returns a parent if the name does not match with this but a parent checks "all tree" and the name matches.
If not null if matches. The returned instance should be the parent for all sub instances.