s1885 - added ability for privileged user to permanently delete a user

...rol-Server/src/ca/nrc/cadc/ac/server/UserPersistence.java

...ol-Server/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAO.java

...r/src/ca/nrc/cadc/ac/server/ldap/LdapUserPersistence.java

...rol-Server/src/ca/nrc/cadc/ac/server/web/UserServlet.java

...c/ca/nrc/cadc/ac/server/web/users/AbstractUserAction.java

...src/ca/nrc/cadc/ac/server/web/users/DeleteUserAction.java

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

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

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

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

...a/nrc/cadc/ac/server/web/users/UserActionFactoryTest.java