Add new 'secret_tokens_get' and refactor 'test_set_cookie_procs' to include cases handled by the deleted ancient tests in 'acs-admin/www/test/signed-cookies-test'
added utility function xowiki::filter_option_list to select a subset from an option listadded form.form to ease creation of forms as form pages (important for using forms from global instance as form pages in workflows)