no migrations for dependent plugins re #3539

git-svn-id: svn://develop.studip.de/studip/trunk@27477 c5b85792-5220-0410-ad23-ed5b6b8ad999
refs #3565 : relocate js and css

git-svn-id: svn://develop.studip.de/studip/trunk@27478 c5b85792-5220-0410-ad23-ed5b6b8ad999
refine [27475] by hiding the email input if sso is used, re #3669

git-svn-id: svn://develop.studip.de/studip/trunk@27479 c5b85792-5220-0410-ad23-ed5b6b8ad999