simtest: forged changes, aborts of expired remakes, envelopes of another swarm

Simulations backing what the review's fixes changed, beyond their unit
tests:

* a_change_forged_under_another_members_actor (1145): a change made
  under b's actor at the seq of b's last change, judged by a: refused
  as forged, b not refused as a whole, b's next write taken.
* an_expired_remake_aborted_by_any_member (1150): under the policy, a
  coordinator gone before it decides; b aborts its remake once it
  expired a grace period ago, c takes the abort, nothing refused.
* a_strict_swarm (1155): a value alice signed for another swarm,
  replacing the one there, is refused as such.

0 files changed, 0 insertions, 0 deletions