Overriding the default install of @Core and @Base

[seth vidal]

> If anyone here has battled with trying to make the perfect install 
> situation, you know what I'm talking about ;)   Any help regarding this 
> would be greatly appreciated.
> 

And has been answered here on MANY MANY occasions you can either:
1. rebuild the installer with a new comps.xml to your specifications
(harder than you think it might be, esp to get the deps right)

2. remove the packages you don't want in %post using something that can
automatically remove deps - like yum, apt, etc.

-sv