This is an inefficient hack. Can you tell I really didn't want to
implement this? MPP was finalized in 2018 FFS.
We do this by adding another "auto" layer, which removes all too-small
channels, and then makes our MPP node pile all the funds into the largest
channel it chooses.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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