Adding new group to comps-f19.xml.in

[Ravindra Kumar]

> Well, if comps groups can't subsume other comps groups, that rather
> seems to suck. The 'have these groups included in @standard and @base-x'
> approach seemed by quite a long margin the best one; the alternatives
> all seem to suck.

In the current situation, the closest we could get is directly
including these packages in the packagelist for @standard and @base-x
groups. But, that has its own drawbacks :-(

Thanks,
Ravindra