Binucleating Macrocyclic (14)N4 Ligands and Their Complexes. Synthesis of the Free Ligand 2,3-Dioxo-5,6:13,14-dibenzo-9,10-(4′,5′-dimethylbenzo)-1,4,8,11-tetraazacyclotetradeca-7,11-diene (L) and of the 7,12-Me2-L Metal Complexes and