Former Tesla President @jonmcneill says Elon Musk kept employees motivated post-IPO by "starving the balance sheet": "Even after we were public, we operated Tesla on a quarter's worth of cash." "I kept saying to Elon, 'I would like a little breathing room.' He's like, 'No. We've got to think like we're young entrepreneurs: if you're two steps from death—you operate differently.'" "I was like, 'Man, we have a quarter's worth of cash, but we have 70 days of payables. That means we have less…