Some code improvments
Merge branch 'develop' into APD-TreeAdvSearch

Conflicts:
	grails-app/services/de/ddb/apd/InstitutionService.groovy
APD-562: Footer: DDB-Logo protrudes content
https://jira.deutsche-digitale-bibliothek.de/browse/APD-559: Pagination seen twice for search with 0 results
APD-573 Cleanup InstitutionService:
- Fix Javadoc
- Rename method
Merge branch 'APD-562_mse' into develop
Create tests for getChildren and getParents on ItemService
Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/apd into develop
HOTFIX APD-574
Remove unused variables
- Fix imports
- Remove unused private methods
Remove senseless ? operator
adv search tree with tektonik
Merge remote-tracking branch 'origin/APD-Sonar-Cleanup' into develop
https://jira.deutsche-digitale-bibliothek.de/browse/APD-577: Object page: Add closing icon to selected archive/tektonik in the tree
APD-576: Object page: adpat facet search box
Merge branch 'APD-TreeAdvSearch' into develop

Conflicts:
	grails-app/services/de/ddb/apd/InstitutionService.groovy
APD-583: Change bottom of detail page -> part 4
APD-583: Change bottom of detail page -> part 3
APD-583: Change bottom of detail page -> part 2