re #4063
add missing class files
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git-svn-id: svn://develop.studip.de/studip/trunk@29142 c5b85792-5220-0410-ad23-ed5b6b8ad999
re #4063
explicit require_once

git-svn-id: svn://develop.studip.de/studip/trunk@29143 c5b85792-5220-0410-ad23-ed5b6b8ad999