spin kickstart/minimization cleanups

[Bill Nottingham]

Peter Robinson (pbrobinson at gmail.com) said: 
> > Not sure you can make it seamless without just copy&pasting the
> > entire group (which is a bad idea). <grouplist> within <group>
> > is ignored in comps.
> 
> Ah, I just copied the xfce-software-development as it was small and
> had what I wanted. What's the proper way to do this then? Looking
> further down the file the Desktops category looks like it would be
> what I want.

Categories aren't a yum-able object; they're used by anaconda only.

Bill