- Added more bytes in/out and service time tracking. There is one pair

- Added more bytes in/out and service time tracking.  There is one pair
  of byte counters for the server-side (http,ftp,gopher,wais,ssl,pass).
- Also separately track cache hits, misses, and not-modified replies.
- Try to track ICP query service time, but this may not be implemented
  right.
- Removed '60min' average, now we have 5 minutes max