Stopped-Flow Spectroscopic Studies on the Ligand-Exchange Reaction of Cu–(Glycine-Peptide) Complexes, Cu(H − i L), with Cysteine. Cu(II) Transport and Characterization of the Intermediate Ternary Complexes Cu(H −1 L)(Cys − ); L = Glycylglycine ( i = 1), Triglycine ( i = 2), Tetraglycine ( i = 2 or 3), and Pentaglycine ( i = 2 or 3)