pre-RRIP 1.12 images
Replaced the extent-LBA based inode number by a static 32 bit counter.
I deem it safe because if the numbers repeat within a single image
reading, then we are doomed anyway. I banned inode number 0 just in
case it has a meaning.
TODO: what if ER says IEEE_1282 but the PX field has only 36 bytes ?
Delayed the computation of El Torito until
all other computation methods were called.
This ensures that the LBA of isolinux.bin is
already computed when the patching gets defined.
The position of the El Torito writer in the list
was not changed. The call sequence of the write
methods was not changed.
With the specified isolinux option, a MBR is written to the system area, and this
allows the image to boot from either CD/DVD or USB sticks.
This is also supported on overwriteable media (note that system area is always
overwritten), but it should not work on multisession media.
Currently isolinux images are patching on-the-fly during image writing, and
that can be a problem on multisession images, as we may be reading the
old image after begining the burning of the new session. That is not supported
in several media and lead to burning failure. Fixed by caching the patched
image on memory.