PTN_SET_LEAF_POSITION
PTN_SET_LEAF_POSITION(PT_NODE(node), position);
PTN_SET_LEAF_POSITION(target, PT_SLOT_ROOT);
PTN_SET_LEAF_POSITION(target, id->id_slot);
PTN_SET_LEAF_POSITION(target, PT_SLOT_ROOT);
PTN_SET_LEAF_POSITION(parent,slot);