strict: no strict remake of a swarm strict already

Review 2, N2: nothing checked that a strict remake's base wasn't strict
already. In a strict swarm the registry, the policy and the bans change
only as a user who may change them signs; a strict remake committed by
a majority of members, each with keys of its own, could drop any of
them (unban, remove managers, empty userSigned and the sealed
declarations), and the honest minority would follow.

A node now takes a strict remake (proposing or voting) only in a swarm
not strict yet: turning strict is done once, by a remake; after it, by
signatures.

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