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polled socket system. This much more cleanly and efficiently integrates peer (and other server to server) connections into the normal server I/O framework and should also eliminate for good the annoying server hangs that result when our old blocking client I/O threads got their pants wedged. git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5510 542714f4-19e9-0310-aa3c-eee0fc999fb1