first step of the big refactoring ("tree" branch).

From here on, we can track changes. It made no sense to put the
development up to this point into git.

include/handlers.h

@@ -21,6 +21,7 @@
 int handle_key_press(void *ignored, xcb_connection_t *conn,
                      xcb_key_press_event_t *event);
 
+#if 0
 /**
  * When the user moves the mouse pointer onto a window, this callback gets
  * called.
@@ -200,5 +201,6 @@ int handle_transient_for(void *data, xcb_connection_t *conn, uint8_t state,
 int handle_clientleader_change(void *data, xcb_connection_t *conn,
                                uint8_t state, xcb_window_t window,
                                xcb_atom_t name, xcb_get_property_reply_t *prop);
+#endif
 
 #endif