Remove the messy iterate-all-sockets loop in favor of iterate-known-sockets.
HEY! LISTEN! Check this commit. I removed the re-identify song-and-dance because it isn't needed: the server basically gives a client a neutered conncetion until it successfully verifies itself, so no need to continually poke it.
Bump min client version to 0.3.2 and bump client version to 0.3.2 (probably should have been done earlier). Also, rather than having the server just send an opaque alert to the client, have it send a specific message so that the message is handled client-side.