Rewrite SQL
** Remove second tw_users query in get_tweets()
** Use tw_archive_link table, to allow tweet to belong to several archives
*** Create and populate this table
Create default front page to list available archives, when no archive is selected
Admin page to manage / create / update archives
** Initial authentication against credentials stored in config.php
Improve chart functionality:
** Day/week views
** Controls for view and period covered
** Show empty columns as empty (rather than just missing)
** Improve div structure to make "filled" bar area selectable selectable in JS
Move to Twitter API 1.1
1.x
Database update
** Additional columns (description/update frequency for tw_archive, role for tw_users)
Introduce keyword cloud
oAuth authentication via Twitter
** roles defined in tw_users
Utilities
** Install script
** cron.php script to allow all archives to be updated from a single cron line