docs: def mangle_form(form):
      "Utility to monkeypatch forms into paperinputs, untested"
      for field, widget in form.fields.iteritems():
          if type(widget) is forms.widgets.TextInput:
              form.fields[field].widget = PaperTextInput()
              form.fields[field].label = ''
          if type(widget) is forms.widgets.PasswordInput:
              field.widget = PaperPasswordInput()
              field.label = ''
      return form