[DRAFT] channeld: allow fundee dip into funder reserves, once. #3501
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This is an alternative to #3500, but it requires acks from the other implementations before I'd consider releasing it into the wild.
The spec does NOT prohibit the fundee from adding an HTLC if the funder can't afford the fee, (due to races, it cannot!) though implementations try to avoid it. We do too, but this code skips that check if this is the only HTLC we're adding, so we don't get stuck.
Not sure how other implementations will respond to this, so waiting for discussion around lightning/bolts#728