Revert "Differentiate links from plain text"

(Oops, this made tabs on the festival pages have blue text...)

This reverts commit c5c836609fd904a3c3b3dffe68ea0d9f756cba76.
Put the call to action in a <p> so the sign in link gets bold
Fix reset buttons; add flash messages
Admin users can act as ordinary users
Discard the fest2 stuff

Switch load & dump tasks to work on the production database
Discard the importer
Clean up db/seeds
Add Changes page
Fix display of screening modal for films without countries
Remove the priority-problem warning
Fix zero-versus-one-based error in picks javascript