Better formatting for the qps value

[Antti Kaihola]

I get lines like this from qps:

2012-02-03 13:43:59 2012-02-03 13:44:14 1241    82.7333333333

A truncated value like 82.73 would look nicer in the rightmost column (queries per second).

[Adam Ever-Hadani]

fixed in commit just now - thanks for feedback!