[dev] tabbed patch to accept client as argument

I really wanted to use tabbed as a generic tool for tabbing any XNest-aware
client, but the current code would require I have a seperately compiled
version for each client (tabbed-surf, tabbed-xterm, etc) The attached patch
is my solution. It allows an invocation like:

./tabbed xterm -into

or

./tabbed surf -e

-- 
Stephen Paul Weber, @singpolyma
Please see <http://singpolyma.net> for how I prefer to be contacted.
edition right joseph