[yocto] File system for alternate partition

[Bollinger, Seth]

>Make bitbake give you a tar.bz2 and then create the partitions etc.
>yourself 
>using an additional script. Wether it could be integrate I do not know.

I guess I didn¹t think about using a full image as I would need to remove
a bunch of stuff, but maybe that is the best way.  That way I can keep the
flexibility of defining recipes that would be installed to my data
partition image.  I will give it a try.

Seth