Let a link's receiver find its streams' inputs again (017, stage 3)

A stream finds its input once, when it is made; an app that starts again
with another module may have the input at another number, of another
shape, or none. pure_link_receiver_rebind marks the streams to inputs of
a prefix stale: each finds its input again by name, with the fields it
was laid out with, before its next delivery and at its sender's next
packet, keeping what it holds; one none takes is refused as a new one
would be. pure_link_listener_rebind asks it of the listener's thread.
test-link's rebound case stops its app, starts it with the input at
another number, then of another shape taken by name: all 3,000 records
come once, in order (without the rebind, none after the stop).

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