PATCH: Double buffering and other cosmetic fixes

[Valentine Sinitsyn]

Hi all,

attached to this letter is another small patch which implements
double-buffering of the tray icon abd prevents flicking when showing
rotating gears. It's a bit hackerish - all the details can be found in
the my forum post: http://www.qtforum.org/lastpost/17585/Double-buffering-for-KSystemTr.html

Second if is about network strength indicator. As it stands for now,
it is painted in the context menu under menu header (no surprise since
it's a child of menu). Simple hide() call solves the problem.

Regards,
Valentine
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