carbs and bolus tooltips images
working cooperative carbs and bolus tooltips; no detailed bolus info yet
added lonely carbs datapoint for testing carb tooltip when no bolus present nearby
add detailed bolus info; various adjustments/bugfixes
factor out opacity, opacityDelta variables; fix position of basal tooltips at edges of display
no really, fix position of basal tooltips at edges of display (i.e., another fine-detail tweak)
Merge branch 'jebeck/carb-and-bolus-tooltips'

Conflicts:
	js/plot/tooltip.js
fix text on carbs and bolus tooltips when at right edge of display
remove event listeners properly by name, not by wholesale annihilation
move 'total' on extended boluses into tspan
further tweak to removal of event listeners on navigation