Revert back isohybrid offset to default setting.
Revert back isohybrid offset to default setting.

This revert back the commit 991a5c69.
This causes more problems than solving (fixing the warning issue in parted)

With the default offset 0:
* makes posibble to create others extra partitions on USB key
  and use them inside the live enviroment.
* makes posible to use /dev/disk/by-label/ symlinks.
  archiso_early hook, can be removed.

Note: archboot also uses the default offset 0.

More info at:
http://mailman.archlinux.org/pipermail/arch-releng/2010-March/000912.html
http://mailman.archlinux.org/pipermail/arch-releng/2010-March/000890.html

Signed-off-by: Gerardo Exequiel Pozzi <f366e24919a755584052c42c8303af2b142d3e55@yahoo.com.ar>

dock0/dock0