AUDIT: Review !57

src/main/java/org/caosdb/server/entity/Entity.java

.../java/org/caosdb/server/entity/wrapper/EntityWrapper.java

...org/caosdb/server/entity/xml/EntityToElementStrategy.java

...db/server/entity/xml/IdAndServerMessagesOnlyStrategy.java

...n/java/org/caosdb/server/grpc/CaosDBToGrpcConverters.java

.../org/caosdb/server/grpc/EntityTransactionServiceImpl.java

src/main/java/org/caosdb/server/transaction/Retrieve.java

...va/org/caosdb/server/grpc/CaosDBToGrpcConvertersTest.java

...test/java/org/caosdb/server/transaction/RetrieveTest.java