Bug 354106

ksystemlog should use PolicyKit instead of kdesu to gain required privileges:

Disadvantages of kdesu:
- a full application running as root on a users X11 server with unlimited permissions is a huge attack surface for all kind of exploits, vulnerabilities etc.
- application is started as root, which makes the application use a different style/iconset etc than the current user's profile. This is visually unpleasant
- increased memory usage, as all components for a second user session (DBus, KDE services, …) needs to be loaded

Advantages of PolicyKit:
- the application runs as the regular user without any visual disruptions
- only those privileges required are given which immensively lowers the negative security impact
- more transparency for the user which privileges the application has through the PolKit agent's interface
- the context of the current user is provided, which would make it possible to also inspect the current user's session journal