Documents the event messsage protocol
Remote control doc improvements
inspect registers now ignores built-in tasks
Events are now buffered up in the worker and sent as a list.  Not using timers, so will only buffer up to $concurrency events
Prefork: Use i % total to cycle between ready_fds instead of shuffle
Asynpool: remove outdated localization to random.shuffle
Cosmetics
Stresstests: CSTRESS_TRANS enables transient messages