print network traffic statistics

 nicstat is to network interfaces as iostat is to disks, or prstat
 is to processes. It is designed as a much better version of "netstat
 -i". Its differences include:
 .
  - Reports bytes in & out as well as packets.
  - Normalizes these values to per-second rates.
  - Reports on all interfaces (while iterating)
  - Reports Utilization (rough calculation as of now)
  - Reports Saturation (also rough)
  - Prefixes statistics with the current time