Define install instead of making subclasses call standard_install
Remove unnecessary require from test
tor: additional optional deps

Some additional optional deps for Tor.

Hopefully, sooner rather than later, libsodium will be an accepted
alternative to nacl given it supplies many of the same headers.

Also removes the example file, as upstream regenerate it periodically
and currently we don’t seem to respect that regeneration and leave
outdated sample files in etc.

Adds a set of caveats about the ` torrc ` file, similar to the ones we
have for ` clamav ` and others.
tor: update 0.2.5.10 bottle.