A total re-write to clean up some ugly code. The major difference is this version uses a constant connection to its tracking agents (when using PBS). Thus, I believe the results are a bit more accurate.
A total re-write to clean up some ugly code. The major difference is this version uses a constant connection to its tracking agents (when using PBS). Thus, I believe the results are a bit more accurate.

I dropped support for tracking a single PID. It
was never useful anyways.

Added tons of comments.

Closes #2308

r22976

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