Patch: use polygons in log statistics stacked line graph

Hi,

The attached patch changes log statistics stacked line graph to use
filled polygons instead of lines.

Here it is in pictures:
* old: http://aras-p.info/img/misc/stackedline-old.png
* new: http://aras-p.info/img/misc/stackedline-new.png

I split drawing code into a new function for the stacked line case, so
now there is CMyGraph::DrawSeriesLine and
CMyGraph::DrawSeriesLineStacked; this felt cleaner and more efficient
than doing checks inside one function.

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

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