fix the clock on every boot

- remove the one-off clock fix in asroot because it won't be effective
  if the clock loses time after the next boot,

- fix the clock on every boot, (a copy of olpc.fth from 12.1.0 with
  the force-2014 fragment added),

- replace the boot script in the filesystem.
reset clock to 2014-01-01

- requested by Adam

- also added a warning message on boot
add boot compatibility for Q2D07

- ofw-version$ and ofw-model$ are not present in Q2D07, so define them
  if they are missing,
Merge pull request #1 from quozl/master

fix clock changes