static int compare( const void *arg1, const void *arg2 )
static int compare( const void *arg1, const void *arg2 , void *unused)
static int compare( const void *arg1, const void *arg2 ){	VectorInfo ** p1 = (VectorInfo**)arg1;	VectorInfo ** p2 = (VectorInfo**)arg2;	return (*p2)->references - (*p1)->references;}