It is now impossible to add 2 equal students
2. Modified the RepostoryServer
Modified Files:
src/java/de/fhworms/ztt/ox/campusdatarepository/StudentCatalog.java
src/java/de/fhworms/ztt/ox/repositoryserver/RepositoryServer.java
src/java/de/fhworms/ztt/ox/repositoryserver/RepositoryServerImpl.java
src_test/java/unit/de/fhworms/ztt/ox/campusdatarepository/StudentCatalogTest.java