Changelog
- Fundamentally changing the CLI. Everything that could be done before can still be done, it's just in a slightly different format. Please see the README for more details
- Added the ability to specify validation rules in postprocessing files. If validation fails, the document can be tagged with a new tag. This is useful for detecting when postprocessing failed (e.g. it extracted a creation date of the middle of the month, when documents of that type should always only be created on the last day of the month)