Add unlink clone checker. - Monitor changes of DOM-tree of the document - Unlinking a clone is actually removing the clone and copying nodes from the source. - Copy value of ID of a node to saved_id to track source of copy nodes. - For a new node with 'saved_id' is a copy of another node. - Copy vulae of 'saved_id' to 'ns0:duplicate-src' to keep the source - Change value of 'saved_id' to the value of ID of the node for later copying. - For a new node without 'saved_id' is not a copy of another node. - only set 'saved_id' to the value of its ID.

#ifndef __MBBUTTON_H
#define __MBBUTTON_H
typedef struct _mb_button {
    mb_obj_t obj;
    redraw_man_t *rdman;
    int state;
    coord_t *root;
    coord_t *active;
    coord_t *normal;
    coord_t *click;
    void (*press)();
    void *arg;
    observer_t *obs_move,*obs_out,*obs_press;
    mb_progm_t *progm;
} mb_button_t;
mb_button_t *mb_button_new(redraw_man_t *rdman,mb_sprite_t *sp, char *name);
void mb_button_add_onClick(mb_button_t *b, void (*h)(void *arg), void *arg);
#endif