Allow funder to dip into reserve if increased fee #1331
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See lightning/bolts#728 and lightning/bolts#750
Allow a funder to dip into its channel reserve to pay the increased commit tx fee for one incoming HTLC.
This prevents being stuck with an unusable channel.
This is an alternative to #1319. I am waiting for feedback from the other implementations to see which of the two solutions we choose to merge.