allow override of automatic adjustment of datetime axis
I have a datetime x-axis. Right now, my graph is automatically turning it into a weekly view, but it only shows the dates on the x-axis every 7 days. It would be great if I could force it to 'day' instead of 'week' view so that I can see every date on the axis, or change it so that every day of the week shows up.
Set the xAxis tickInterval option to 24 * 36e5 (= one day)