Tonight marks the debut of CSI: AWP–as is After William Petersen.Petersen’s iconic character Gil Grissom took his leave last Thursday, with audiences flocking back to wave bye-bye. Nearly 2.6 million Canadians (out of simulcast, as CTV`s PR machine points out) and 24.25 Americans watched CSI at 8 p.m. last Thursday night, the crime drama`s biggest