Add socket traffic stats to listsockets

I was able to get this to work by recompiling the module, placing it in `datadir/modules/` and putting the edited index.tmpl in `datadir/modules/listsockets/tmpl/`

My only peeve right now is that sometimes the data columns line-break between the number and the unit, but I don't feel like messing with that right now, and it works well enough I think.