Thanks to del_query_parameters and get_querystring, we build the link
        with preserving interesting get parameters and removing the others

def get_basic_sort_link(self, request, field):
        """
        Thanks to del_query_parameters and get_querystring, we build the link
        with preserving interesting get parameters and removing the others
        """
        query_string = self.get_querystring()
        sort_string = self.get_next_sort_string(field)
        if sort_string:
            sort_link = request.path + '?' + sort_string
            if query_string:
                sort_link += '&' + query_string
        else:
            sort_link = request.path
            if query_string:
                sort_link += '?' + query_string
        return sort_link