Delete a case from the database

        Args:
            ind_obj (puzzle.models.Individual): initialized individual model

def delete_individual(self, ind_obj):
        """Delete a case from the database

        Args:
            ind_obj (puzzle.models.Individual): initialized individual model
        """
        logger.info("Deleting individual {0} from database"
                    .format(ind_obj.ind_id))
        self.session.delete(ind_obj)
        self.save()
        return ind_obj