Election table styling

[jmcarp]

A few minor issues on styling election tables (screenshots below):

• Value bars for one cell can run into the next
• The contribution location table is hard to read with too many candidates selected

@noahmanger and @jenniferthibault: I'm guessing you're already aware of these--just filing the issue so we get these in better shape before launch.

[noahmanger]

I'm fixing the issue of bars running into one another with #581.

Not sure how to handle the issue of too many candidates. Any ideas?

[jmcarp]

I was hoping that we could just use the scrollX option in DataTables (https://datatables.net/reference/option/scrollX), but I tried, and it seemed to conflict with something in our styles. If that behavior seems reasonable, maybe @noahmanger or @msecret could take a look at getting scrollX to work, or pairing with me to debug.

[jenniferthibault]

Table cells definitely need more padding between each other— not sure if your fix addresses this @noahmanger , but one way I did that in the mockups was to left-align the cell copy with the column title copy, instead of the sorting arrow. Here's an existing mockup for how a scrolling table could look (including the cell alignment), which, I think is what scrollX does, as far as I can tell?

[noahmanger]

I'm running into snags trying to get the scrollX working. @jmcarp do you mind taking a look?

[jmcarp]

@noahmanger I got a decent start on this but could use a second pair of eyes on a few last issues--see description in #661.

[noahmanger]

This has been resolved.