An Important Metal Complex in the Asymmetric Synthesis of α-Amino Acids. The Crystal and Molecular Structure of (−)546-((R)-Alaninato)((6R,8R)-6,8-dimethyl-2,5,9,12-tetraazatridecane)cobalt(III) Bromide Trihydrate, (−)546-[Co(R-ala)(1,5R,7R,11-Me4-2,3,2-tet)]Br2·3H2O