Begin an epoch only from the answer to this offer, not an earlier one

A sender that took its epoch for lost offers epoch 1 again with a new
key. The receiver accepts it in the turn, after the answers; until then
its answers still carried the ACCEPT of the earlier offer, which named
the same epoch. The sender began its epoch from that one, the two sides
held different secrets, and 2 s later it took the epoch for lost again:
a turn of that each time the order fell so. Now an ACCEPT carries the
first four bytes of the key it answers, and a sender begins its epoch
only from one that answers its own.

test-link cuts the path for 3 s the moment the sender begins an epoch,
three times; a sender's counts say how many epochs it took for lost,
and it must be three. Before, it was four.

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