Fixed width bars on bar charts to match fixed axis

[brian_vachta]

I have a chart that gets updated automatically with data, and I want a fixed bar width so that when I only have one data point for the chart, the bar doesn't resize to overlap several values on the axis. This is necessary to be compatible with a start point and end point on the X-axis. This isn't a problem when you have a consistent number of columns, but I can't achieve that without introducing fake data.