piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 8957e5abcb03f0b7d9bc0a9d0a7782785796803f

Nick Mathewson efe55b8898 Bump copyright date to 2019.		%!s(int64=5) %!d(string=hai) anos
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tests	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos
Cargo.toml	38d644c94b Remove rlib+staticlib configuration for Rust crates	%!s(int64=5) %!d(string=hai) anos
errors.rs	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos
ffi.rs	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos
lib.rs	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos
protoset.rs	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos
protover.rs	efe55b8898 Bump copyright date to 2019.	%!s(int64=5) %!d(string=hai) anos