Floating Assistants

[Olivier JG]

Changed the look of the assistants and made them float, did a bit of 
cleanup in the process. Patches and an image* attached.
Looking for feedback on the look and the patches (David?).
-Olivier JG

PS: Is there a more specifically suited widget for this? It's a QToolbar 
for now...

(*) kscreenshot doesn't show cursor, it's hovering over the selected 
button and giving the shown tooltip.
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