piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ f9f08666e4fdb1975395e2d6ddc9ff2415fc2639

Roger Dingledine f9f08666e4 tweaks and responses to the spec		23 lat temu
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CLIENTS	7a18057357 starting to document what clients need to do and why	23 lat temu
tor-spec.txt	f9f08666e4 tweaks and responses to the spec	23 lat temu