Plugin Upgrades
Remove elements in objectview which are redundant as they come from main
layout
Recursive closure to get IDs of all archives
Add comment to a magic closure, remove println
Fix APD-113-Object-Tree-Problem-folders-one-item' into develop

Upgrade of Plugins
Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/apd.git into develop