Return type string, compatible with numpy.

def get_var_type(self, name):
        """
        Return type string, compatible with numpy.
        """
        name = create_string_buffer(name)
        type_ = create_string_buffer(MAXSTRLEN)
        self.library.get_var_type.argtypes = [c_char_p, c_char_p]
        self.library.get_var_type(name, type_)
        return type_.value