802 - Clustered/Stacked plots are horizontal

Added 3rd argument to clusteredBarPlot and stackedBarPlot
If argument is false, horizontal mode is enabled
Uses correct scale/projector in accordance if isVertical or not

Close #802.
ok, i think maybe i was wrong about this being a good idea- i thought more lines of repeated code would get factored out - im not sure factoring out a single attr swap is worthwhile