Added a stats directory with data for both inbound WRITEs and READs.

Both stats/inbound-reads and stats/inbound-writes contain data for
1100 clients, spread over 11 client machines.

Run average.sh stats/inbound-reads to get 17 million as the average.
Run average.sh stats/inbound-writes to get 30 million as the average.

average.sh takes into account only the last 20 lines of the data file.
So, ITERS_PER_MEASUREMENT has been reduced a lot to generate data
quickly.