Eta(2)-Coordination of Si-H Sigma-Bonds to Transition-Metal Fragments That Also Bind Eta(2)-Dihydrogen Ligands and Agostic C-H Bonds - Synthesis and Characterization of Eta(2)-Silane Complexes Cis-Mo(Eta(2)-H-Sihr’(2))(Co)(R(2)PC(2)H(4)Pr(2))(2)