[Tetraphenylphosphonium](1+) {3,3′-commo-bis-[η5-1,2-dicarba-(3)-nickel(III)-closo-dodecaborate]}(1−)-monotetrachloromethanate, [(C6H5)4P]+{Ni3+[η5-(3)-1,2-B9C2H11]2}− · CCl4: Synthesis, structure, and temperature-dependent EPR spectra