Fixes #3282: plotBorder width changes sign, causing a strange animation
Regard `startOfWeek` option in data grouping
#3295 labels do not render 0 as value
Made point.click event work in combination with drilldown charts.
Highstock: Fixed #3299 where Y axis labels on subsequent panes would be drawn outside the plot area when they should be inside like the first pane.
Fixed #3300 where data labels would remain semi-transparent when chart updated in the middle of labels fading in.
Merge pull request #3286 from tahajahangir/fix-startOfWeek-data-grouping

Regard `startOfWeek` option in data grouping
Fixed #3285, funnel and pyramid center option not working for vertical dimension.
Allow overriding Highcharts.numberFormat from the outside. Closes #3284.
Micro optimized
Fixed #3088, tooltip blocking new mouse interaction after hiding when useHTML is true.
Fixed #3276 with HTML markup in element titles when a label is shortened by ellipsis.