Changelog:

* Bug fix: iso_write_opts_set_part_like_isohybrid() did not cause a MBR
           partition table if the partitions are data files in the ISO
           rather than appended
* Bug fix: The lseek methods of IsoFileSource for local filesystem and loaded
           ISO returned libisofs error codes as positive off_t numbers
* Bug fix: Freshly cloned data files from imported image were not marked as
           imported. Thanks to Ivan Shmakov. (Closes: #1022851)
* Bug fix: Size of further CE area was calculated wrong if its CE entry ended
           exactly at a block boundary
* New iso_write_opts_set_system_area() option bits 16:
  GPT "Legacy BIOS bootable" and 17: GPT writable
* New API calls iso_assess_written_features(), iso_read_image_feature_named(),
  iso_read_image_features_text()
* Allowed lseekable device files with iso_tree_add_new_cut_out_node().
  Proof-of-concept by Ivan Shmakov.
* New API call iso_write_opts_set_max_ce_entries()

Signed-off-by: alperak <alperyasinak1@gmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>