Patch: statistics pie graph font, X axis label

The attached patch improves pie graph in log statistics dialog. Patch
is against 1.5.x branch, but should be easy to apply to trunk.

It uses same font as other graph types, and draws X axis label.
* before: http://aras-p.info/img/misc/pie-old.png
* after: http://aras-p.info/img/misc/pie-new.png

-- 
Aras Pranckevièius
work: http://unity3d.com
home: http://aras-p.info

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