signatures: sign what is sent

A node signed its changes no rule signs a while after them (--sign-every
1s): the change left at once, unsigned, and its signature followed on
its own a second later, to every neighbour, over every link. A few
writes made a cascade of SIGNATURES. Under a policy requiring
signatures it signed every change as it was made instead.

A node now signs its latest change, if no signature vouches for it, as
a sync message takes it (--sign-every sent, the default): the
signature leaves in the same message, and goes where the change goes.
One signature per message, however many changes it carries, each
vouching for those before it: a slow writer's every change is signed,
a fast writer's batches are, at no threshold to pick. A policy
requiring signatures signs what is sent too, even with `none`. `all`
still signs every change as it is made; changes to protocol data,
listed paths and ?signed=true writes are signed as they are made, as
before. The interval, and the task signing on it, go.

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