dataLabels are blocking mouse drag for columns

[KacperMadej]

When trying to drag a column and dataLabel is in front, then the drag is blocked.

Demo: http://jsfiddle.net/Lbpto4oy/1/ Steps:

1. Drag by the dataLabel on the 100 value column -> nothing happens

[TorsteinHonsi]

Actually nothing happens on either of the columns unless we drag on the rifled handle, even though the cursor indicates otherwise. Perhaps we should do something about the cursor.

Also (although I don't see the actual bug), I assume a workaround could be to add a CSS rule like:

.highcharts-data-label {
    pointer-events: none
}

[MercusChan]

@TorsteinHonsi I just found the column (blue color bar) also looks draggable.