finish unfucking the screen_ctx handling.

remove screen_current() it was utterly bogus when nscreens > 1.

pass a fake client_ctx in the case where there's no client and the
kbfunc or mousefunc doesn't need a real one, it just contains the
current screen, modify these functions so that they pass down the screen
context to their callees.

make groups per screen, it's the only way it makes sense in this regard.

ok okan@.

calmwm.c

@@ -30,8 +30,6 @@ Cursor				 Cursor_default;
 Cursor				 Cursor_question;
 
 struct screen_ctx_q		 Screenq = TAILQ_HEAD_INITIALIZER(Screenq);
-struct screen_ctx		*Curscreen;
-
 struct client_ctx_q		 Clientq = TAILQ_HEAD_INITIALIZER(Clientq);
 
 int				 HasXinerama, HasRandr, Randr_ev;
@@ -73,8 +71,6 @@ main(int argc, char **argv)
 	Starting = 1;
 	dpy_init(display_name);
 
-	group_init();
-
 	bzero(&Conf, sizeof(Conf));
 	conf_setup(&Conf, conf_file);
 	xu_getatoms();
@@ -149,8 +145,6 @@ x_setupscreen(struct screen_ctx *sc, u_int which)
 	int			 fake;
 	u_int			 ndesks = CALMWM_NGROUPS, nwins, i;
 
-	Curscreen = sc;
-
 	sc->which = which;
 	sc->rootwin = RootWindow(X_Dpy, sc->which);
 	sc->xmax = DisplayWidth(X_Dpy, sc->which);
@@ -158,6 +152,7 @@ x_setupscreen(struct screen_ctx *sc, u_int which)
 
 	conf_color(&Conf, sc);
 
+	group_init(sc);
 	font_init(sc);
 	conf_font(&Conf, sc);
 
@@ -187,7 +182,7 @@ x_setupscreen(struct screen_ctx *sc, u_int which)
 	}
 	XFree(wins);
 
-	screen_updatestackingorder();
+	screen_updatestackingorder(sc);
 
 	rootattr.event_mask = ChildMask|PropertyChangeMask|EnterWindowMask|
 	    LeaveWindowMask|ColormapChangeMask|ButtonMask;