Remove some remnants of bitstring labels
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rbt node chains were sized to allow for bitstring labels, so they had 256 levels; but in the absence of bistrings, 128 is enough.
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dns_byaddr_createptrname() had a redundant options argument, and a very outdated doc comment.
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A number of comments referred to bitstring labels in a way that is no longer helpful. (A few informative comments remain.)