(By Rick Rothacker, rrothacker@charlotteobserver.com) Bank of America plans more belt-tightening in 2011, likely meaning more job cuts ahead at the nation's biggest bank and one of Charlotte's biggest employers.Chief executive Brian Moynihan told analysts on Friday that the bank will be more aggressive in cutting costs as the year goes on, although he said the bank is still adding jobs in growth areas and keeping thousands of extra workers to deal with loan modifications and foreclosures.