Ring election message lower bound

Also called Omega(n log n) lower bound for ring election, Pachl-Korach-Rotem bound, Frederickson-Lynch bound.

Comparison-based leader election on a ring needs Omega(n log n) messages in the worst case.

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Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
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