use SORM instead plain sql, closes #29

app/controllers/admin/semester.php

app/controllers/admission/courseset.php

app/controllers/course/admission.php

app/controllers/course/basicdata.php

app/controllers/course/members.php

app/controllers/course/statusgroups.php

app/controllers/course/studygroup.php

app/controllers/my_courses.php

lib/admission.inc.php

lib/classes/AutoInsert.class.php

lib/classes/MembersModel.php

lib/classes/Seminar.class.php

lib/classes/UserManagement.class.php

lib/functions.php

lib/models/AdmissionApplication.class.php

lib/models/CourseMember.class.php

tests/functional/_bootstrap.php