Merge branch 'ac2' of /srv/cadc/git/wopencadc into s1832

projects/cadcAccessControl-Server/build.xml

...er/src/ca/nrc/cadc/ac/server/web/users/GetUserAction.java

...rc/ca/nrc/cadc/ac/server/web/users/UserActionFactory.java

...rver/src/ca/nrc/cadc/ac/server/web/users/UserServlet.java

.../test/src/ca/nrc/cadc/ac/server/RequestValidatorTest.java

...rc/cadc/ac/server/web/groups/AddUserMemberActionTest.java

...cadc/ac/server/web/groups/RemoveUserMemberActionTest.java

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

...sControl/src/ca/nrc/cadc/ac/xml/AbstractReaderWriter.java