Code for PIR-based onion service lookups (client and server)

Ian Goldberg 746f980c29 Start the pirserver code %!s(int64=5) %!d(string=hai) anos
Makefile 746f980c29 Start the pirserver code %!s(int64=5) %!d(string=hai) anos
pirserver.cc 746f980c29 Start the pirserver code %!s(int64=5) %!d(string=hai) anos
pirserver.h 746f980c29 Start the pirserver code %!s(int64=5) %!d(string=hai) anos
protocol 746f980c29 Start the pirserver code %!s(int64=5) %!d(string=hai) anos