def all_to_category(self, default_category):
        topics = self.all()
        for topic in topics:
            topic.help_category = default_category
            topic.save()
        string = "Help database moved to category %s" % default_category
        logger.log_info(string)
Shifts all help entries in database to default_category.  This
dataset/ETHPy150Open evennia/evennia/evennia/help/manager.py/HelpEntryManager.all_to_category