Add fixed-positioned wrappers on some components, so the tooltip mouse handler will always be above them.

Cursor part 2 - WDFN-101

Async store test

the tooltip and audible modules.
- So it can be mapped to the integer range input slider, change the state of
cursor to be the offset, in milliseconds, since the first point in the input
range.
- Create tooltipPointsSelector, which uses tsCursorPointsSelector, to calculate
the (x, y) location of all the points to display tooltips for.
- Use D3 general update pattern to toggle tooltip display states

Wdfn 143 hide troubleshooting links

Ajax test

- Update the link function to pass a third argument to callbacks - a context object returned from the last invocation of the callback.

provide error handling for bbox failures when the div isn't being shown

Wdfn 163 - Median Data Parsing throws an error if there is no data

Wdfn 162 fim links should not appear on non fim sites

Wdfn 160 flask trailing slash

Wdfn 129 - Text (dismissable?) indicating this is a new test product we're seeking feedback on

Wdfn 150 do not show graph for no data sites