Fixes direction to be render-forward for all plots and themes, fixes #18...

This is related to enhancement/defect: https://bugs.dojotoolkit.org/ticket/18061

It is a simple patch to the plots to reverse the draw order so it draws theme-forward consistently (theme entry 0 goes to series 0, theme entry 1 to series 1, and so on).  Prior to this some plots rendered reverse order, some rendered forward.  It made it inconsistent when displaying several cart types together in terms of their draw color sequence.  This also makes it simpler to build new themes as the draw order makes more sense.

I verified in the current/modern dojo code base this does not affect the way stack charts render, they still render properly stacked, just with theme color draws in forward order.