all: Add iso9660_get_rock_attr_str to get an ls-like mode string for rock

ridge.

{cd,iso}-info.c util.{c,h}: put common printing routine in util.c

rock.h: add enum for NM flags
iso9660.h: move mode_t typedef so it can be used in rock.h
xa.{c,h}: small typos.

test/*: in most cases better output. On VCD's however there there is a
slight regression on displaying the filename someitmes. Will be
addressed later.

test/copying.right

@@ -4,7 +4,7 @@ PARTICULAR PURPOSE.
 __________________________________
 ISO-9660 Information
 /:
-     2048 Jan 10 2004 00:47  .
-     2048 Jan 10 2004 00:47  ..
-    17992 Jan 10 2004 00:47  copying
+  d      2048 Jan 10 2004 00:47  .
+  d      2048 Jan 10 2004 00:47  ..
+  -     17992 Jan 10 2004 00:47  copying