Show the search navbar when searching for `pool:1234 tag`. Before the
search navbar would always be hidden if the search contained a pool:
metatag, even if it was a multi-tag search.
Fix the pool name not being bolded in the pool navbar when doing a
pool:<name> search. Previously the selected pool was only bolded when
doing a pool:<id> search.
* Add a gap between thumbnails on mobile.
* Adjust CSS for scores and vote buttons.
* Include "Private favorites" as an incentive on the user upgrade page.
* Fix vote buttons not being visible beneath thumbnails on mobile.
* Fix the "Show scores" link not preserving the current page number.
* Fix vote buttons being unintentionally enabled for all thumbnails by default.
* Fix banned and restricted users being able to favorite posts by
tagging them with `fav:self`.
* Fix search engines being able to crawl /posts?view=score pages.
* Fix broken tests.
* Factor out the post navbar into a component. The post navbar is the
part of the post containing the current search, the list of pools, and
the list of favgroups, along with next/prev navigation links.
* Change navbar markup: remove various unused CSS classes/IDs, change
pools to use same markup as favgroups, replace nested <div>'s with
flat <ul>/<li> list.
* Use CSS to truncate long searches/pool names/favgroup names if they're
too wide for the screen (especially on mobile).
