* First rough draft for BABE revert
* Proper babe revert test
* Cleanup
* Test trivial cleanup
* Fix to make clippy happy
* Check polkadot companion
* Check cumulus companion
* Remove babe's blocks weight on revert
* Handle "empty" blockchain edge case
* Run companions
* Simplify the filter predicate
* Saturating sub is not required
* Run pipeline
* Run pipeline again...