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This patch is not compatible with current mainnet `nedes`, but three other patches provides a three-stage migration plan. Instead of sending a list of triplet `(name, major, miner)`, we now only announce only one triplet `(chain_name, distributed_db_version, p2p_version)`. The `chain_name` must be the exact same on each host. The two others `*_version` are negotiated independently with the following algorithm: - announce the greater known version; - choose the minimal number between the announced one and the received one; - accept the connection only the chosen version is known locally. This algorithm is fairly complete unless we introduce "hole" in the sequence of acceptable version numbers.
