AUDITING alone, at one time, defined PricewaterhouseCoopers International, or PwC. But the mammoth organization, its chairman Dennis M. Nally has suggested, now derives a huge chunk of its revenues worldwide from over 163,000 employees toiling away not just at auditing, but consultation work on financial restructuring, optimizing resource allocation and use, doing away with redundant support activities, and validating corporate legal structure ef