DOC: Documention source code.

src/main/java/caosdb/server/CaosDBServer.java

src/main/java/caosdb/server/accessControl/UserSources.java

.../caosdb/server/resource/AbstractCaosDBServerResource.java

src/main/java/caosdb/server/utils/ServerMessages.java

src/main/java/caosdb/server/utils/Utils.java

...sdb/server/resource/TestAbstractCaosDBServerResource.java

src/test/java/caosdb/server/utils/UtilsTest.java