interval and iterations available as two default options by default

Hi,

this is a feature request to get tcprstat closer to tools like vmstat and iostat. By default on these tools first two numbers provided on command line with no option will be used as a delay and count i.e. -i and -n. So for example if I run:

vmstat 1 5 -- it will print stats every 1 second for 5 consecutive times
iostat -kdx 1 5 -- same, print 5 iterations with 1 second intervals.

I wish tcprstat would do the same :) Also not if only 1 number is provided it runs infinitely using first argument as a delay.

Thanks,
Aurimas