Patch: statistics graph should draw lines from marker centers

The attached patch slightly improves statistics graph lines. The patch
is made against 1.5.x branch.

Before, the lines were drawn from the sides of marker circles, so
lines would often "feel wrong" (yeah, a subjective thing :)). Some
screenshots to illustrate the point:
* before: http://aras-p.info/img/misc/line-old.png
* after: http://aras-p.info/img/misc/line-new.png

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

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