Added more tests

dbrepo-metadata-db/setup-schema.sql

...tadata-db/test/src/main/java/at/tuwien/test/BaseTest.java

...e/src/main/java/at/tuwien/endpoints/OntologyEndpoint.java

...vice/src/main/java/at/tuwien/endpoints/QueryEndpoint.java

...est/java/at/tuwien/endpoint/OntologyEndpointUnitTest.java

...st/java/at/tuwien/endpoint/SemanticsEndpointUnitTest.java

...c/test/java/at/tuwien/endpoint/TableEndpointUnitTest.java

...ava/at/tuwien/service/OntologyServiceIntegrationTest.java

...t/java/at/tuwien/service/QueryServiceIntegrationTest.java

.../test/java/at/tuwien/service/SemanticServiceUnitTest.java

...t/java/at/tuwien/service/TableServiceIntegrationTest.java

...src/test/java/at/tuwien/service/TableServiceUnitTest.java

.../main/java/at/tuwien/exception/UserNotFoundException.java

...ices/src/main/java/at/tuwien/service/OntologyService.java

...services/src/main/java/at/tuwien/service/UserService.java

...main/java/at/tuwien/service/impl/OntologyServiceImpl.java

...rc/main/java/at/tuwien/service/impl/QueryServiceImpl.java

...src/main/java/at/tuwien/service/impl/UserServiceImpl.java

dbrepo-ui/components/dialogs/Semantics.vue

dbrepo-ui/layouts/default.vue