Soft fork mechanism to reference major version #1998
Merged
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Soft forks need reference to the major version, so that, for instance,
version (3,0) does not revert changes made in version (2,1).
Originally we had thougth that we would introduce a notion of a
"starting major version", so that a testnet starting in the shelley era
would not have to start at version 2 0. But this may lead to more
confusion, and now we propose just to hard code the version pair.