remake: a strict remake of a strict swarm isn't followed

Review 3, R3: 1186 kept honest nodes from proposing or voting for a
strict remake of a swarm strict already, but a majority of members,
each with keys of its own, could still commit one, and switch and
catchup followed it without asking what kind of remake made the
epoch: the registry, policy and bans of a strict swarm changing by a
member majority, the honest minority following.

A node now refuses to switch to such an epoch (its document's policy
strict, the remake's kind strict), and catchup refuses to rejoin one
whose chain of epochs holds a strict remake after the swarm was strict
(as the old document is, or once a remake since made it so). access.md
says so.

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