clean-up

WDFN-67 - Create a symlog-like graph, using a "compound scale".

Wdfn 76 - Add previous year comparison to the tool tip

Draw median points on top of tooltip. This is not ideal in that if your cursor bases over the circle or the median text you lose your hover focus. I'm going to go ahead and push it out there and see what others think.

Changed to use title and desc tags rather than attributes and added c…

# Conflicts:
#	assets/src/scripts/components/hydrograph/index.js

Wdfn 80 - Show/Hide Median details on click on median circles

Changed to use title and desc tags rather than attributes and added code to remove those attributes before building the new DOM.

Added a click handler for the median point circle to toggle the visibility of the labels. Added a pointer cursor to the median point circle element.

remove unused store attributes