[stack layout] Update win order to mimic xmonad

 Stack layout now use the same order as monadtall or treetab.
 They can now be used in conjonction using the same keybindings.
Make Stack keybindings compatible with MonadTall

 Please merge #433 first.
Improve Stack/MonadTall keybindings compatibility
[Stack layout] Call group.focus to focus new win
Merge remote-tracking branch 'max-k/xmonad' into tuxwave_develop
Merge remote-tracking branch 'max-k/stack' into tuxwave_develop
* Regression fix:

        *Actually you should configure every window
        * It breaked Slice with Max layout (used here for Pidgin)
        because also there was not check that attribute self.focused is
        available.
       * It hided windows which were not focused. This breaks Slice.
       * It is correct to put focused window to the "above" when its focused,
        otherwise you cant change full-maximized windows by layouts next function.
floating.py
WM_CLIENT_LEADER and WM_TRANSIENT_FOR