WIP: dms: show implicit predecessor successor fields

Several things are wrong with this and more generally implicit successor/predecessor:

• new UI is not tested, also for some reason from the web page we don't see the relation to image in new UI
• the web page should not have to have the image reference in the text like this ( this is a workaround that image links are not indexed in searchable text)
• are referenced /related documents proper terms ? this sounds reverse