Increased width requirement of --tcp from 3 to 4.

--tcp truncates the last 3 digits off a value (1000 becomes 1).
It is pretty common to have 4 digit 'established connections' these days, pushing the issue down the road by increasing width from 3 to 4.

TODO: Have some sort of overload, or add a scale (1000 becomes 1k)
Merge pull request #65 from tsaavik/master

Increased width requirement of --tcp from 3 to 4.