"Basic X Window System" option present in smoke12 netinst, missing on DVD

[Jens Petersen]

> There's base-x, which is just the X server & drivers, that lives
> under all desktops. That's on the DVD.
> 
> The other is the 'Basic X Window' environment, which is that plus
> blackbox, xmonad, ratpoison, etc. window managers. It's not on the DVD.

I feel the naming is still confusing: I am thinking to
rename @basic-x-window-environment to @basic-desktop-environment
and @basic-x-window-desktop to @basic-desktop in F19.
I hesitated to do that for F18 to further break the string
freeze though maybe should have before it got translated...

Also I would like to propose Basic Desktop Spin for F19.

Jens