piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 66ecdcdd7573f1dafbdb1e14a7ef375f04be812c

Nick Mathewson 1a74881063 Merge branch 'maint-0.2.8'		9 éve
..
.dummy	df76da0f3b Add a .dummy file in the changes directory to stop git from removing it	10 éve
buf-sentinel	3cea86eb2f Add a one-word sentinel value of 0x0 at the end of each buf_t chunk	9 éve