[dwm] cycling through clients

Hi everyone,

I'm quite used to alt-tab like cycling through open program windows and
I was missing that in dwm.

I wrote one for the current version where

next_client() moves the next visible client to the master area and moves
the old one to the *end* of the stack ( counter clockwise movement )

and

prev_client() pulls the last visible client to the master area and moves
the current one to the top ( clock-wise )

just add this file to your config.h and make your bindings...

comments are welcome.

-- 
engin tola - http://cvlab.epfl.ch/~tola