Deuterium adsorption on (and desorption from) SiC(0?0?0?1)-(3???3), $(\sqrt{\sf 3} \times \sqrt {\sf 3})$ R30?, $({\sf 6}\sqrt {\sf 3} \times {\sf 6}\sqrt{\sf 3})$ R30? and quasi-free-standing graphene obtained by hydrogen intercalation