Moved nepomuk query service to kdereview.

The service consists of three parts:
1. The actual service to be moved to kdebase/runtime/nepomuk/services
2. The query client which provides a class to access the query service without fiddling with DBus. To be moved to kdebase/workspace/nepomuk
3. The nepomuk query library which provides shared classes used by service and client.

To be moved to kdebase/workspace/libs/nepomukquery (here I need input: this would make runtime depend on workspace. Is that possible? Any better solution?)