Connect relationshipEntities <-> Entities

[Henni]

We have to connect the relationshipEntities to the actual entities defined by groups 1 and 2.

This is the final step! Let's do this! 🚀

[Sandr0x00]

See #79
relationshipEntities and entities get now linked together.
But, this only works if the name we find is exactly the name in the DB, therefore we won't link many entities, I fear.
Pseudonyms are not filled in the DB, so there is no linking for pseudonyms yet.

[simonzachau]

@SANDR00 👍

For now, this is the only thing we can do. As soon as pseudonyms are in the db, this feature is worth to be developed!

@vviro we've talked about this on the hackathon at your office.