-/* layout.c */
-void floating(const char *arg); /* arranges all windows floating */
-void focusclient(const char *arg); /* focuses next(1)/previous(-1) visible client */
-void initlayouts(void); /* initialize layout array */
-Client *nexttiled(Client *c); /* returns tiled successor of c */
-void restack(void); /* restores z layers of all clients */
-void setlayout(const char *arg); /* sets layout, NULL means next layout */
-void togglebar(const char *arg); /* shows/hides the bar */
-void togglemax(const char *arg); /* toggles maximization of floating client */
-void zoom(const char *arg); /* zooms the focused client to master area, arg is ignored */
-