refs #651, fix violations of coding conventions

git-svn-id: svn://develop.studip.de/studip/trunk@26205 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixes #3436, remove outdated directory

git-svn-id: svn://develop.studip.de/studip/trunk@26206 c5b85792-5220-0410-ad23-ed5b6b8ad999
fixes #3437

git-svn-id: svn://develop.studip.de/studip/trunk@26207 c5b85792-5220-0410-ad23-ed5b6b8ad999