Check for v2-installations before setup
It might be that users install v3 over v2 and want to use the same lists-directory. We should catch that case and show an error-message with advise:
- Move v2-dir
- re-run
schleuder install
- migrate lists
It might be that users install v3 over v2 and want to use the same lists-directory. We should catch that case and show an error-message with advise:
schleuder install