saved session to file - returns after finish
        only called by interactiveTutorial-save at the moment

def blockingSave(self, path):
        """
        saved session to file - returns after finish
        only called by interactiveTutorial-save at the moment
        """
        self.tmp_dir_save_session = self.tmp_dir_session.join('block').mkdir()
        state = {'session': dict(self.opts),
                 'dialogs': self.dialogs.saveState()}
        self.saveThread.prepare('0', path, self.tmp_dir_session, state)
        self.sigSave.emit(self)
        self.saveThread.run()