substanced

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And subscribe to it within the auditlog package (include the transaction id).

The transaction package does not emit events before or after commit; you have to register a before/after commit hook. We could change pyramid_tm so that it registered a before commit hook that would write the undo data to the audit log, but then we'd need to change pyramid_tm to accept some sort of after-commit-hook function, and it'd be a lot better if the transaction package just itself emitted events in those cases and Substance D itself subscribed to them.