Ignore caps lock and numlock for keyboard bindings. The way Xlib makes

you do this is ugly. Also remove mod2 (numlock) and mod3 (odd) from the
list of keybinding modifiers. They don't make much sense here.

based on a heavily modified diff from Martynas.

ok okan.

calmwm.h

@@ -384,7 +384,7 @@ void			 xev_register(struct xevent *);
 void			 xev_loop(void);
 
 int			 xu_ptr_grab(Window, int, Cursor);
-int			 xu_btn_grab(Window, int, u_int);
+void			 xu_btn_grab(Window, int, u_int);
 int			 xu_ptr_regrab(int, Cursor);
 void			 xu_btn_ungrab(Window, int, u_int);
 void			 xu_ptr_ungrab(void);