Gather after a save until a just-answered client has come back

After a round that saved, the owner waited for 100 us without a new
request (1 ms at most) before the next round. Requests that queued up
during the save made that quiet start at once, so the clients just
answered missed the next round; the clients then settled into two
halves taking turns, each save carrying half of them. It showed with
two connection threads: 34 events a round and 15.8-16.0k posts/s with
64 connections, against about 61 and 22-24k/s with one or three. The
quiet now counts only once a request has come after the answers were
handed back: two threads carry 61.6 events a round, 22.9-23.9k/s.

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