reportview: horizontal_multibar legend and tooltip order

[Steven-Eardley]

This is due to highcharts' handling of inverting the graph. When the chart is drawn horizontally, the bars will be out-of-order from the vertical order, plus out of sync with the labels.

See the following JSFiddle:
https://jsfiddle.net/tmr5meas/1/

On line 105, try using series.reverse() - the bars are in a more similar order to the column chart, but the legend is backwards.