wordblock enhancement

The default wordblock.conf provided by the guys at chonqed.org matches agaist
URLS beginning with http. But DokuWiki also links simple www.example.com links.
Spammers used this method to place blacklisted URLs in the Wiki.

This patch constructs full URLs from these shortcut-URLs before applying the
blacklist regexp.

The patch also fixes a problem with the toolbar not appearing when the blacklist
hit and denied saving.

darcs-hash:20060926192420-7ad00-519df90a5953b690428bfa0928de37b3053031b0.gz