Halo is under all series instead of being under the hovered point

[KacperMadej]

Expected behaviour

A point's halo on hover visible on top of underlying series, like column.

Actual behaviour

A point's halo is under all series.

Live demo with steps to reproduce

http://jsfiddle.net/519vfcdr/

Steps:

1. hover first point to see that it's halo is under a column

It's also a problem with maps - halo is visible only when a point is not over a land:
http://jsfiddle.net/o2ctd5p3/

[pawelfus]

Internal note:
How about moving halo into the series group like in the commit above?