Festival#show tweaking

Add instructions (show/hide still to come)
tweak festival header
turn off autoscheduler_debugging for now
Don't abbreviate in the long date format
Add title text to flags
Tweaks to the assistant page

use radio buttons for the unselect choices
sort locations to exclude
Tweak the screening modal

Make the header & footer more compact
fix spacing around the screenings
Switch back to famfamfam flags

Add the flag to the screening modal
Add credit back
Rename FAQ to Help because FAQ is too geeky even for me.
Prevent extra registrations of click events
Make cache keys more distinct
Add short_name to film; use it on the grid
Add old favicon for now
fix a few image sizes to warn the browser
Hard-code PIFF on the front page for now
don't show per-user sorts when not signed in
Better prioritization intro