fix #816385 by [re]loading only new/edited comment and properly edit the DOM using js. Also: cleanup javascript, try to put form where the comment will be located (not yet finished)

- self.varmaker is now defined on self._cw
- self.initialize_varmaker is not required anymore

[views] ticket #474762, login link next to comment redirect to the login popup and does not leave the current page

        adding a comment

         comment if it has the permission to do it