s1885 - users no longer sorted in groups

...ca/nrc/cadc/ac/server/web/groups/AbstractGroupAction.java

...ca/nrc/cadc/ac/server/web/groups/AddUserMemberAction.java

...nrc/cadc/ac/server/web/groups/RemoveUserMemberAction.java

...test/src/ca/nrc/cadc/ac/server/ldap/LdapGroupDAOTest.java

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

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

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

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