Allow chart to determine/set auto-height/width.
This would add a chart width/height setting of "auto". For bar charts, the auto height uses the point width and padding options to determine the "correct" height of the plot box, instead of using the size of the container. For column charts, the chart would grow/shrink horizontally to fit all columns.
We experimented with this in http://jsfiddle.net/gh/get/jquery/3.1.1/highcharts/highcharts/tree/samples/highcharts/studies/axis-staticscale/