[PATCH] Several rows in taskbar

[Olivier Goffart]

Hi, 

The patch add the support for showing taskbar entry in several rows  (with all 
the animations ans stuff)
When there is too much task shown in the taskbar, it automatically take more 
rows.

The main modification is in Plasma::BoxLayout which i modified to be able to 
have severals row.

Why did i modify this layout and not creating a ne "GridLayout"?  Because the 
API stay the same, and the code is the same if row==1.

The way I calculate the number of row probably need some adjustement. Maybe a 
function  BoxLayout::setItemRatio(qreal) which would allow component to 
choose the better ratio for them.

Please CC me replies.
-- 
Gof
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