ADVBOOT for KOBO 
An advanced boot application selector for KOBO devices by shadoooo.

This boot selector allows a user to choose which application to start at powerup,
and / or to choose between different boot configuration scripts.
It is based only on shell scripts, so it doesn't require any additional binary 
software, except for what is already present on KOBO devices.
Basically it consists in a rcS boot file modification, allowing the execution
of custom scripts, in three different times of the boot sequence:
- at initialization (after hardware devices setup, and possibly upgrade triggers,
   but before any other execution, including graphical animator)
- after initialization, but before execution of KOBO hindenburg and nickel execution
- at the end of the boot sequence, after KOBO hindenburg and nickel has been launched
Scripts are launched in name sorted sequence from related folders, respectively:
/mnt/onboard/.kobo/advboot/init_run for initialization scripts
/mnt/onboard/.kobo/advboot/pre_run for scripts executed before nickel and hindenburg
/mnt/onboard/.kobo/advboot/post_run for scripts executed after nickel and hindenburg

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v1.2
The modified rcS is based on original rcS file of 3.30 firmware
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v1.1
The modified rcS is based on original rcS file of 3.20 firmware
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v1.0
The modified rcS is based on original rcS file of 2.10 firmware, up to firmware 3.10.
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