Several TCP fixes, improvements.#1025

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Dirbaio wants to merge 4 commits intomainfrom

Commits on Dec 28, 2024

tcp: set ack_all when remote acks bytes sent in earlier retransmissions.
Dirbaio
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Commits on Dec 29, 2024

tcp/tests: make sure line number in recv_nothing points to the test code.
Dirbaio
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tcp: start retransmit on first data sent, fix FIN retransmit in CLOSING.
Dirbaio
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Commits on Dec 30, 2024

tcp: add zero window probe support.
Dirbaio
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