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

Conflicts:
	grails-app/services/de/ddb/apd/InstitutionService.groovy
adv search tree with tektonik
Merge branch 'APD-TreeAdvSearch' into develop

Conflicts:
	grails-app/services/de/ddb/apd/InstitutionService.groovy