LFS-BOOK PDF generation

[Gerard Beekmans]

> Alright. I've enabled the PDF section in the nightly LFS render script. 
> I'm running it through cron ahead of schedule in a few minutes to make 
> sure it's able to find all the JDK, FOP and FAI stuff.
>   

That seems to work properly now. PDF is added to the nightly generated 
files.

While I was at it, I rescheduled the cron job to generate the nightly 
files at 1:00 AM rather than 4:15 AM it used to be.

Gerard