Log Message:
Import libisofs-1.3.6 as sysutils/libisofs, packaged by ryoon and
myself for wip, tested by Thomas Schmitt and Freddy Fisker.

libisofs is a library to create an ISO-9660 filesystem with extensions
like RockRidge or Joliet. It is also a full featured ISO-9660
editor, allowing you to modify an ISO image or multisession disc,
including file addition/removal, change of file names and attributes,
etc.