Plugin to check submitted notices with blogspam.net

When new notices are saved, we check their text with blogspam.net (or
a compatible service).

Blogspam.net is supposed to catch blog comment spam. Some of its tests
(min/max size, bayesian match) gave a lot of false positives so those
tests are turned off by default.

Installation
============
add "addPlugin('BlogspamNet');"
to the bottom of your config.php

Settings
========
none

Example
=======
addPlugin('BlogspamNet');