Nodes on an interpolation now only get the address tags of
interpolations and then compute their own parent from that. They no
longer inherit the parent directly.
Use the same update mechanism as for updates on the interpolations
themselves. Updates must solely happen in place_insert as this is
the place where actual changes of the data happen.
Instead of requesting the match tokens from the tokenizer
when looking for parent streets/places and address parts,
hand in the saved tokens and ask if they match. This gives
the tokenizer more freedom to decide how name matching
should be done.
