Minor refactor to keep import results in Importer
Create missing relations after CNMV import (rough). See #25
Do nothing when an imported entry has an unknown relation type #25
Cleaning up test wording
Simplify import code. #25
Add comment
Do not import the same fact twice. #25
Import _from_ data, if available #25
When importing, enrich existing relations if possible, instead of creating new ones. #25