Relax closing fee requirements, implement quickclose#4599

Merged

rustyrussell merged 10 commits intoElementsProject:masterfrom

niftynei:nifty/closing-fee-range

Sep 9, 2021

Commits on Sep 8, 2021

Makefile: Update BOLT version to cover bolt11 test vectors with payment secret.
rustyrussell
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channeld: allow large HTLCs if peer offers option_support_large_channel
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Makefile: update spec version
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Makefile: update bolt version to include option_anchors_zero_fee_htlc_tx.
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Makefile: import latest spec, which includes quickclose.

niftynei
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rustyrussell
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--experimental-quick-close to enable quick-close negotiation
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closingd: allow higher closing fee if anchor_outputs.
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pytest: add test for closing feerate greater than final commit tx.
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closing: add option to set closing range.
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close: spec is final, it's not experimental.
rustyrussell
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