dialogs: add specialized redirect()-method to studip controller for easier handling, re #5156

git-svn-id: svn://develop.studip.de/studip/trunk@32894 c5b85792-5220-0410-ad23-ed5b6b8ad999
mark studip controller's infobox method as deprecated, re #5170

git-svn-id: svn://develop.studip.de/studip/trunk@32895 c5b85792-5220-0410-ad23-ed5b6b8ad999
remove duplicate redirect method from [32894], re #5206, re #5156

git-svn-id: svn://develop.studip.de/studip/trunk@32896 c5b85792-5220-0410-ad23-ed5b6b8ad999