get-all-narrative-versions
Complete deletion of narratives and their versions

- refactor 'delete-narrative-version into 'delete-uuid
- re-create 'delete-narrative-version using 'delete-uuid
- create delete-narrative-item using both of the above
Ensure narrative-tests starts and ends with empty graph
Stop package-qualifying 'get-current-narrative-version
Bugfix the first remove-narrative-item unit test

Actually use 'delete-narrative-item now that we have such a function.
Another narrative-item removal bugfix
Add unit tests for checking versions of narrative items