Provide control over X axis point in dataGroupng
Grouped points are aligned to the left of the group by default when dataGrouping is applied.
smoothed option allows the data to be shifted to the middle of the group.
Would be great to have option to get grouped points with X coordinate of rhe most right point of the group.
It would be nice if the approximation() function in plotOptions.series.dataGrouping could also return the x-value we want the grouped point to sit at instead of always defaulting to the first point.