new panel look and feel

[Marco Martin]

this adds multiple cache and multiple settings to panelsvg, now changing 
prefix does not force a repaint anymore.
made the task applet to use panelsvg (very little changes here)
it still has problem (sometimes a task has a size slightly different to the 
other, this is kinda evil) it seems to perform quite well
a test svg is at http://www.notmart.org/misc/tasks.svg
not meant to be a final one, but the look is kinda nice already :)

Cheers,
Marco Martin
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