Merge branch 'fsdg/ui7969' into 'belenos'

Fix ui7969 - stop unrar-free packaging steering the user toward non-free software

A simple edit of debian/control.  The copyright dates are genuine, this languished on the mailing list, probably because the copyright statement was wrong :).

Built and tested for both Toutatis and Belenos.

https://trisquel.info/en/issues/7969

See merge request !71