Added new feature, yAxis.angle, allowing positioning the axis line and labels in polar chart Y axes. This makes it practical to use multiple axes in polar charts.
Added option, xAxis.nameToX, allowing points to have the same name but different axis positions on an axis of type category.
39 BUGFIXESEXPANDCOLLAPSE
Fixed #1011, ignoreHiddenSeries with ordinal axis caused artefacts on a chart.
Fixed #1041, gaps in the area fill of stacked areasplines.
Fixed #3169, error on drilldown from a null point.
Fixed #3341, exceeded stack size on mutually linked series.
Fixed #3571, NaN in the beginning of data broke series.
Fixed #4778, wrong rendering waterfall series, when yAxis.max was set.
Fixed #5186, gaps in the fill of areasplinerange.
Fixed #5383, mouse position detection with pointPlacement.
Fixed #5528, a regression causing polar arearanges to fail.
Fixed #5533, stickyTracking when set to false caused highlighting wrong point.
Fixed #5552, linejoins in boost module lines.
Fixed #5556, JS error on polygon with empty data.
Fixed #5563, JS error in treemap with zero values.
Fixed #5568, pointIntervalUnit broke when using more data points than turboThreshold.
Fixed #5569, generic options set on the yAxis affected the colorAxis.
Fixed #5570 and #5590, regression causing blank export on Batik based export servers.
Fixed #5572, pie slices were not hidden in 3D pie charts on legend click.
Fixed #5595, HTML tooltip did not hide on point mouse out via the tooltip.
Fixed #5605, error on async onload of destroyed chart.
Fixed #5618, updating master series caused wrong visibility on linked series.
Fixed #5619, the Series remove event was fired when updating a series.
Fixed #5620, text was mispositioned when loading a chart in a hidden iframe in certain browsers.
Fixed #5622, click event for line series point was not called when column was rendered below.
Fixed #5631, zeroes in logarithmic chart made the whole graph crash.
Fixed #5632, gaps were broken in arearange and areasplinerange.
Fixed #5646, waterfall did not work correctly with logarithmic axis.
Fixed #5647, xrange points disappeared if x was outside plot but x2 inside.
Fixed #5647, xrange points disappeared when x was outside visible range.
Fixed #5655, animation: true on a series config caused animation to jump from the middle.
Fixed #5658, error on updating series from its own mouseOver event.
Fixed #5662, setExtremes on polar chart caused padded max value.
Fixed #5665, addPoint animation parameter was not used.
Fixed #5679, handle isArray for ES6 iterator.
Fixed #5681, JS error on adding custom group to points.
Fixed #5689, text had soft line wraps when white-space: nowrap was used in combination with text-overflow: ellipsis.
Fixed issue #4133, error bar data labels positions failing on redraw.
Fixed issue #5205, color axis changed colors when legend was disabled.
Fixed issue #5567, wrong clipping of offline exported SVG in IE11/Edge.
Fixed wrong handling of minRange on logarithmic axis, related to #1227.