root/feedmelinks/admin/clear-logged-IPs.php

new spam-fighting code, including:

* converted login and signup forms to explicit POSTs (not GETs) so they can't be automated
* confirm new accounts via valid email and lock the account until confirmed
* add a one-click "Report this user as a spammer" button for all users
* add a one-click "Snuff this user instantly" button for superusers
* log the IP address of all new accounts for 1 week
* disallow creating > 1 account per IP address per week
* lock out unused accounts after 90 days
* add a bulk-snuffer to snuff whole batches of spammers at once