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.

lib/iso9660/libiso9660.sym

@@ -21,6 +21,7 @@ iso9660_get_pvd_id
 iso9660_get_pvd_space_size
 iso9660_get_pvd_type
 iso9660_get_pvd_version
+iso9660_get_rock_attr_str
 iso9660_get_root_lsn
 iso9660_get_system_id
 iso9660_get_volume_id