[WIP]: Charting: dates on x axis.

work in progress for #839

* extra titles -- what is show_titles for, why is it true even when there's no title in the flash chart?
* too many values on the scale (time)
* some charts still don't have dates on the x axis -- check all
* do we have some recursive Hash.update? -- use that for altering chart properties
typo: cathegory -> category