Rework the dca config

[zonky2]

See MR 45 at gitlab...

• If I delete an attribute (text), the filter rule (text search) is not deleted as well.
• The question is, how do we handle the view conditions? Here there is the relation to two or more attributes - the attribute that is shown or hidden and the attribute or attributes that are reacted to...
• Note as popup for MM if relations to other MM exist, there should be a note that the connection exists - see Meldung beim Löschen eines MM welches referenziert wurde MetaModels/core#938