[feat] implemented GroupAl interface

...dam/gf/exceptions/WrongNumberOfParticipantsException.java

...dam/gf/modules/group/preferences/database/ProfileDAO.java

...les/group/preferences/database/ScaledProfileQuestion.java

...nipotsdam/gf/modules/group/preferences/excel/ItemSet.java

.../gf/modules/group/preferences/groupal/GroupAlMatcher.java

.../modules/group/preferences/groupal/JacksonPojoToJson.java

.../modules/group/preferences/groupal/request/Criterion.java

...dam/gf/modules/group/preferences/survey/SurveyMapper.java

...tsdam/gf/modules/group/preferences/survey/SurveyView.java

...c/main/java/unipotsdam/gf/modules/project/ProjectDAO.java

...hen/src/main/java/unipotsdam/gf/modules/user/UserDAO.java

...rc/test/java/unipotsdam/gf/modules/group/GroupAlTest.java

gemeinsamforschen/src/test/resources/database/fltrail.sql