Switch to KDE 4.3

It's not like the quantum leap from KDE 4.1.3 (shudder…) to 4.2 , but 4.3 is slick and was pretty stable even in β

• Lots of improvement in Plasma: bundled notifications, hover folder previews, taskbar icons work - and a pretty new theme to boot
  
• greatly improved krunner - I love the list view and it's much faster in selecting frequently used programmes
• KDE PIM works at last - no bloody akonadi crashes every 5 minutes
• the NetworkManager has been ported
• revamped system tray

More features in the release announcements.
And it's been out since yesterday! For openSuSE it's still on Factory, though.