Asserting that it “is among the strongest banks in the industry,” Citigroup announced on Monday that it would soon repay $20 billion of federal bailout money. This from a bank that has been in the red for most of the past two years, that is expected to limp through 2010 amid a torrent of loan losses, that saw its stock price close after the announcement at a measly $3.70 a share — and that, like other big banks, is still reluctant to lend.....