When the clock strikes 12 in several minutes, ending the moratorium period and beginning the feeding frenzy of free agency, these are the numbers NBA teams will be working with for the 2012-13 season as announced by the league Tuesday night: The salary cap will be $58.044 million. That is the same amount it was last season. The luxury tax threshold will be $70.307 million. That is also the same as last season. Any team whose payroll exceeds the threshold has to