#420 - handle params field read/save in object relations
(backend/frontend) + unit tests
#421 - relations params now hidden in form (preserved after save)
#420 - check relations params are set
#425 - add unique constraint
standardisation fix
Merge branch 'master' of https://github.com/bedita/bedita
#312 view for custom relations
#312 view for custom relations / single saves e new relation form
Merge branch 'master' into issue/424-multimedia-interactive-images