Documentation request/opportunity

[Hal Murray]

I think we need a chart/table showing the types of packets we send and expect 
to receive.

And another table of the config commands and the packets they 
generate/process.

Maybe there should be notes about the meaning of the old/classic 
types/commands that we no longer support.

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I found a key comment in the code somewhat explaining 2 key words:

>From newpeer():
         * If a peer is found, this would be a duplicate and we don't
         * allow that. This avoids duplicate ephemeral (broadcast/
         * multicast) and preemptible (manycast and pool) client
         * associations.


-- 
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