make it easier to differentiate between visited and unvisited links
Merge branch 'master' of /var/www/tt-irc
additions to previous patch
Merge branch 'master' of /var/www/tt-irc
add visited_rewritten
Revert "add visited_rewritten"

This reverts commit b3cae52de24fc1f1b92995bbce196ce168876e2f.
make some optimizations to visited hack
use visited_urls for normal links
persist visited urls
move visited_url checking to Message initializer