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BOLT 3: fix definition of flip(B) in P. (#779)

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It turns out everyone does `P[B / 8] ^= (1 << (P % 8))`,
which is not what the spec says to do (it implies you
would treat P as a bitstring numbered 255 to 0).

See this stackoverflow question:
	https://stackoverflow.com/questions/49928131/lightning-secret-generation-from-seed

Reported-by: Janus Troelsen @ysangkok (on Twitter)
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Rusty Russell 2020-07-07 16:28:08 +09:30 committed by GitHub
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03-transactions.md
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@ -527,7 +527,9 @@ generate_from_seed(seed, I):
return P
```
Where "flip(B)" alternates the B'th least significant bit in the value P.
Where "flip(B)" alternates the (B mod 8) bit of the (B div 8)
byte of the value. So, "flip(0) in e3b0..." is "e2b0...", and
"flip(10) in "e3b0..." is "e3b4...".
The receiving node:
- MAY store all previous per-commitment secrets.