Proposed content for petitboot v1.12

[Jeremy Kerr]

Hi Maxiwell,

> The 'dev' branch worked with my Ultravisor test-cases.

OK, great.

> You said that you've changed the NVRAM var to match with OF
> convention (preboot-check instead of preboot_check) and added a bit
> of wording to the config help screen. Did you push these
> modifications?

Ah, looks like they were only on the old laptop! Thanks for the
reminder, I'll re-do those changes.

Cheers,


Jeremy