This commit fixes the migration bug which made postgresql
think there still was a relation to a non-exisition table
called scipost_feedback, scipost_motion and scipost_nomination.

CAUTION! This will however reset all existing relations
with the Remark model to VGM models.

Migrations are ready to be run without dataloss.
 If asked during `migrate` to alter stale FK field,
 run with anwser `no`! This is not stale, Django just
 thinks it is due to state migration of the new apps.