split and reorg

cadcAccessControl/src/ca/nrc/cadc/ac/Role.java

cadcAccessControl/src/ca/nrc/cadc/ac/User.java

...ontrol/src/ca/nrc/cadc/ac/UserAlreadyExistsException.java

cadcAccessControl/src/ca/nrc/cadc/ac/UserDetails.java

...cessControl/src/ca/nrc/cadc/ac/UserNotFoundException.java

cadcAccessControl/src/ca/nrc/cadc/ac/UserRequest.java

cadcAccessControl/src/ca/nrc/cadc/ac/WriterException.java

cadcAccessControl/src/ca/nrc/cadc/ac/client/GMSClient.java

...ccessControl/src/ca/nrc/cadc/ac/client/GMSClientMain.java

...ssControl/src/ca/nrc/cadc/ac/client/GroupMemberships.java

...ca/nrc/cadc/ac/client/JsonUserListInputStreamWrapper.java

cadcAccessControl/src/ca/nrc/cadc/ac/client/UserClient.java

...ccessControl/src/ca/nrc/cadc/ac/json/JsonGroupReader.java

...ccessControl/src/ca/nrc/cadc/ac/json/JsonGroupWriter.java

...ssControl/src/ca/nrc/cadc/ac/json/JsonUserListReader.java

...ssControl/src/ca/nrc/cadc/ac/json/JsonUserListWriter.java

...AccessControl/src/ca/nrc/cadc/ac/json/JsonUserReader.java

...ontrol/src/ca/nrc/cadc/ac/json/JsonUserRequestReader.java

...ontrol/src/ca/nrc/cadc/ac/json/JsonUserRequestWriter.java

...AccessControl/src/ca/nrc/cadc/ac/json/JsonUserWriter.java