-/* layout.c */
-void arrange(void); /* arranges all windows depending on the layout in use */
-void focusnext(const char *arg); /* focuses next visible client */
-void focusprev(const char *arg); /* focuses prev visible client */
-const char *getsymbol(void); /* returns symbol of enabled layout */
-Bool isfloating(void); /* returns True if floating layout is enabled */
-Bool isarrange(void (*func)()); /* returns True if func is the layout function in use */
-void initlayouts(void); /* initialize layout array */
-void loaddwmprops(void); /* loads dwm properties */
-Client *nexttiled(Client *c); /* returns tiled successor of c */
-void restack(void); /* restores z layers of all clients */
-void savedwmprops(void); /* saves dwm properties */
-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 */
-