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This removes the FAILING state and adds compulsory signalling during a
new MUST_SIGNAL phase during the last retarget period prior to the
timeout height.
This ensures that if a deployment occurs using bip8 with
lockinontimeout=false and timeoutheight=N, that a later deployment using
bip8 with lockinontimeout=true and timeoutheight=K, where K<N that any
chain where LOCKED_IN is reached prior to height K, will be accepted as
valid by nodes using either set of deployment parameters.
It also ensures that the soft-fork's changed rules are only enforced
on chain a retarget period after signalling indicates enforcement is
expected (which was not previously the case if the FAILING to ACTIVE
transition took place).
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