[REVIEW] Add labelSize() to Plasma::Meter

[Rob Scheepmaker]

This patch is also on reviewboard but anonsvn is down and therefor reviewboard 
doesn't work.

While I was updating the kuiserver applet to use the new progress-bar design I 
suddenly had the need to obtain the size of a label in the progress-bar svg. 
JobWidget displays the filename elided ("file://home/...ample.png") and for 
this to work the width of the label is needed. This patch is pretty 
straightforward, but I didn't want to add something to public api without 
approval from other members of the plasma team.
The new progress-bar look is very lovely btw. Only thing left to be done is 
merge this applet into systemtray...

Regards,
Rob
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