Several fixes for issues with bar and pie chart#173

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SteveBallantine wants to merge 1 commit intoDmitryBaranovskiy:masterfrom SteveBallantine:master

Commits on Nov 8, 2012

Pie chart - old version re-ordered data into order by value. Didn't like this behaviour and it caused problems with the labels/colours so removed it. minPercent and maxSlices functionality modified…

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