piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 1130fd87edb38570dbad9c1a04adfe0947490b2d

Nick Mathewson 1130fd87ed changes file for 21280		%!s(int64=8) %!d(string=hai) anos
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.dummy	df76da0f3b Add a .dummy file in the changes directory to stop git from removing it	%!s(int64=10) %!d(string=hai) anos
bug20824	33dcd0c44b changes file for DROPGUARDS	%!s(int64=8) %!d(string=hai) anos
bug21280	1130fd87ed changes file for 21280	%!s(int64=8) %!d(string=hai) anos
feature20956	83307fc267 Add __SocksPort etc variants for non-persistent use	%!s(int64=8) %!d(string=hai) anos
ticket20174	05c1e2b7d6 Add ChangeLog for check_existing	%!s(int64=8) %!d(string=hai) anos