Support multi-line title in bar graph

[#44616153]
Present multi-line title, its truncation and units in "Bar Graph Example"

[#44616153]
When text is truncated, add a tooltip with full text ($.truncate)

[#44616153]
Add tooltip for Bar Graph titles

[#44616153]

jQuery.truncate does it, but here, in Bar Graph, we can't use typical
methods with work fine for HTML elements. Plugin is used indirectly
and e.g. SVG requires that "title" is a separate element, not just
attribute.