Transfering inode numbers from PX entries to IsoNode during image import

and using these numbers in PX entries during next image generation.
This also answers the concerns about PX without ino in RRIP 1.12
and PX with ino in RRIP 1.10 images produced by mkisofs.

libisofs/node.h

@@ -399,4 +399,29 @@ struct zisofs_zf_info {
 int iso_file_zf_by_magic(IsoFile *file, int flag);
 
 
+
+/* ts A90427 : might become API */
+/*
+ * @param flag
+ *     bit0= do only retrieve id if node is in imported ISO image
+ *           or has an explicit xinfo inode number
+ * @return
+ *     1= reply is valid from stream, 2= reply is valid from xinfo
+ *     0= no id available,           <0= error
+ */
+int iso_node_get_id(IsoNode *node, unsigned int *fs_id, dev_t *dev_id,
+                    ino_t *ino_id, int flag);
+
+/* ts A90427 */
+/* Set a new unique inode ISO image number to the given node.
+ * This number shall eventually persist during image generation.
+ */
+int iso_node_set_unique_id(IsoNode *node, IsoImage *image, int flag);
+
+/* ts A90427 */
+/* Use this with extreme care. Duplicate inode numbers will indicate hardlink
+ * relationship between the nodes.
+ */
+int iso_node_set_ino(IsoNode *node, ino_t ino, int flag);
+
 #endif /*LIBISO_NODE_H_*/