remake: a replay taken back keeps the node its author

Review 2, N4: replay_newest names the node the document's author once,
before its first group. Taking a refused group back forks the document
at the heads before it, and Automerge's fork has no author; when the
refused group was the actor's first change, the next one was committed
as seq 1 without the footer naming the node, refused as "it names no
node", taken back too, and so on: the whole replay in the quarantine
with a misleading reason.

The fork now names the node its author again. Test: the first group
refused (a capability revoked in the new epoch), the next replayed.

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