piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ f10a23d9a4dc9e334512f3f87a134b266b4943b5

Nick Mathewson f10a23d9a4 Merge branch 'maint-0.3.5' into release-0.3.5		5 lat temu
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.dummy	df76da0f3b Add a .dummy file in the changes directory to stop git from removing it	9 lat temu
ticket29168	be84ed1a64 kist: Don't write above the highwater outbuf mark	5 lat temu