Added C functions to write .rdx, .tdx, .ndx binary taxonomy files from a

taxonomy C structure

src/obidms.h

@@ -106,6 +106,12 @@ typedef struct OBIDMS {
 	int						view_dir_fd;						/**< The file descriptor of the directory entry
 																 *   usable to refer and scan the view directory.
 																 */
+	DIR*					tax_directory;						/**< A directory entry usable to
+																 *   refer and scan the taxonomy directory.
+																 */
+	int						tax_dir_fd;							/**< The file descriptor of the directory entry
+																 *   usable to refer and scan the taxonomy directory.
+																 */
 	bool					little_endian;						/**< Endianness of the database.
 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 	 */
 	Opened_columns_list_p 	opened_columns;						/**< List of opened columns.