moved cas_auth to old_plugins dir and took it out of svn:externals

plugins/old_plugins/README

plugins/old_plugins/cas_auth/README.txt

plugins/old_plugins/cas_auth/cas/CAS.php

plugins/old_plugins/cas_auth/cas/PGTStorage/pgt-db.php

plugins/old_plugins/cas_auth/cas/PGTStorage/pgt-file.php

plugins/old_plugins/cas_auth/cas/PGTStorage/pgt-main.php

plugins/old_plugins/cas_auth/cas/client.php

plugins/old_plugins/cas_auth/cas/domxml-php4-php5.php

plugins/old_plugins/cas_auth/cas/languages/english.php

plugins/old_plugins/cas_auth/cas/languages/french.php

plugins/old_plugins/cas_auth/cas/languages/greek.php

plugins/old_plugins/cas_auth/cas/languages/languages.php

plugins/old_plugins/cas_auth/images/connex_cas.gif

plugins/old_plugins/cas_auth/manifest.xml

plugins/old_plugins/cas_auth/start.php

...plugins/cas_auth/views/default/account/forms/getemail.php

...ld_plugins/cas_auth/views/default/account/forms/login.php

...s/old_plugins/cas_auth/views/default/account/getemail.php

...s/old_plugins/cas_auth/views/default/actions/getemail.php

...plugins/cas_auth/views/default/settings/cas_auth/edit.php