Tools to access and modify a file system image without having to
mount it.

Classic commands included (prefixed with fsu_):

* cat, diff, du, find, ls
* chflags, chmod, chown, mv, rm, rmdir
* cp, ln, mkdir, mkfifo, mknod, touch

New commands:

* fsu_ecp (cp-like which allows the user to get/put files from/to the image)
* fsu_exec (executes a local command like text editor on a file from the image)
* fsu_write (writes its input in a file on the image)
* fsu_console (a command console tool that uses previous commands and adds
  directory browsing)