Tor2web was never implemented for v3 onion services.

(Even if it only affects a few relay operators.)

The required protocol version check occurs before the consensus flavour
check. So on directory mirrors (and some client configs), alpha users need
to delete both consensus flavours to workaround nss bugs.

Closes ticket 27756.

Duplicate comes from introducing this define into 0.2.9, which did not yet
have KIST.

This mocking was not available in 0.2.9.

This avoids asymmetry in our public relay stats, which can be exploited for
guard discovery and other attacks.

The rest of rephist uses uint64_t internally. Let's make these take it too,
so we don't have to worry about overflowing size_t on 32 bit systems.

This shouldn't be a user-visible change: nobody has a 16 MB RSA
key that they're trying to use with Tor.

I'm doing this to fix CID 1439330 / ticket 27730, where coverity
complains (on 64-bit) that we are making a comparison that is never
true.

This is really annoying, since we can't use cfg(test) for doctests.

Closes ticket 27288