Initial import: a kioslave listing the network from a device centric point of view, WIP

Includes a rudimentary library solidnetwork which might become part of solid very later on.
It contains objects which represent the current topic of the network and gets updated as the topic changes.
The backends might be the service discovery services (DNSSD,SLP,...), user/admin edited data, and whatever else helps to know about what is/should be in reach of this computer over the net.

Currently DNSSD as delivered by KDNSSD is used to feed some data to play with.

Note: If you play with this version of networkkio, press reload after entering network:/ the first time, because the cache is only filled after the first call to the kioslave.