iso9660fs has been cleaned up and debugged. It now supports:
* ISO 9660 Level 3,
* System Use Sharing Protocol (SUSP),
* Rock Ridge Interchange Protocol (RRIP).
The following Rock Ridge features are supported:
* POSIX file attributes (PX),
* POSIX device number (PN),
* Symbolic links (SL),
* Alternate file name (NM),
* Timestamps in 7-byte format (TF).
Change-Id: Ib227411bdda5bc10a957b27ad05fafdc95eca35f