piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 8c136b3a06de2aad8523ae68fa7e94cbfbf51f94

Roger Dingledine 7a18057357 starting to document what clients need to do and why		23 rokov pred
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CLIENTS	7a18057357 starting to document what clients need to do and why	23 rokov pred