ATHENS, Nov 7 (Reuters) - Greek auditors have unblocked a$1.2 billion sale of a prime seaside property at the abandonedAthens airport of Hellenikon, court officials said on Friday,freeing up Greece's biggest privatisation deal since its debtcrisis. The auditors in September had blocked the sale of theproperty from privatisation agency HRADF to Lamda Development, which is backed by Chinese and ...