Add GTC support to knetworkmanager

[kevin.kofler at chello.at (Kevin Kofler)]

I wrote:
> AFAICT, the patch actually touches the common code, so it should add this
> support for both the monolithic KNetworkManager and the plasmoid.

Hmmm, I might be wrong though?

In any case, we'll want this patch right now, if additional changes are 
needed to add this support to the plasmoid, we'll want those too.

        Kevin Kofler