* Starting Yakuake a second time now toggles the window state, making it possible to open and retract Yakuake from a panel button or similar. Improves consistency with the main window activation mechanic of other single-instance KDE applications, and provides an easier way to get at the application UI than the D-Bus interface in case of a hotkey screwup.

* Disabled standard startup notifications ("Launch Feedback" for Yakuake).