remaining native SVG tooltips

Native SVG smbg and bolus/wizard tooltips.

@ianjorgensen can you take a quick look? Would like to merge this today (and work through merge conflicts with @nicolashery while merging in his new workflow branch).
Did you want to remove the `tooltips` variable? Seems like you're only using `nativeTooltips` now? You also removed the `container.tooltips()` method...