Log Message:
wm/sdorfehs: import package

sdorfehs is a tiling window manager descended from ratpoison, which itself is
modeled after GNU Screen.
sdorfehs divides the screen into one or more frames, each only displaying
one window at a time but can cycle through all available windows (those
which are not being shown in another frame).
Like Screen, sdorfehs primarily uses prefixed/modal key bindings for most
actions.
sdorfehs's command mode is entered with a configurable keystroke
(Ctrl+a by default) which then allows a number of bindings accessible with just
a single keystroke or any other combination.

Special thanks to David H. Gutteridge for the patch and explanations.