IT WAS MEANT TO BE ANIL AMBANl'S big DAY in MORE ways than ONE. ON February 11, Reliance Power, which had just wrapped up India's biggest ipo ever and the first from Ambani's Reliance-Anil Dhirubhai Ambani Group, was to list on the Bombay Stock Exchange. As much as the investors in the Rs 11,500-crore ipo, which was oversubscribed 73 times, Ambani must have been anxious.