split and reorg

...ontrol/test/src/ca/nrc/cadc/ac/client/UserClientTest.java

...st/src/ca/nrc/cadc/ac/json/JsonGroupReaderWriterTest.java

...src/ca/nrc/cadc/ac/json/JsonUserListReaderWriterTest.java

...est/src/ca/nrc/cadc/ac/json/JsonUserReaderWriterTest.java

.../ca/nrc/cadc/ac/json/JsonUserRequestReaderWriterTest.java

...est/src/ca/nrc/cadc/ac/xml/GroupListReaderWriterTest.java

...src/ca/nrc/cadc/ac/xml/GroupPropertyReaderWriterTest.java

...ol/test/src/ca/nrc/cadc/ac/xml/GroupReaderWriterTest.java

...test/src/ca/nrc/cadc/ac/xml/IdentityReaderWriterTest.java

...t/src/ca/nrc/cadc/ac/xml/UserDetailsReaderWriterTest.java

...test/src/ca/nrc/cadc/ac/xml/UserListReaderWriterTest.java

...rol/test/src/ca/nrc/cadc/ac/xml/UserReaderWriterTest.java

...t/src/ca/nrc/cadc/ac/xml/UserRequestReaderWriterTest.java