def all_tags

      all_variables.remap do |(fei, vars), h|
        vars.each { |k, v| (h[k] ||= []) << v if Ruote.is_a_fei?(v) }
      end
    end
def all_tags

      all_variables.remap do |(fei, vars), h|
        vars.each { |k, v| (h[k] ||= []) << v if Ruote.is_a_fei?(v) }
      end
    end
Returns a hash tagname => array of feis of all the tags set in the process
 instance.