blogspam: New plugin, adding spam filtering for page editing / comment posting using the BlogSpam.net API.

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+[[!template id=plugin name=blogspam author="[[Joey]]"]]
+[[!tag type/auth]]
+
+This plugin adds antispam support to ikiwiki, using the
+[blogspam.net](http://blogspam.net/) API. Both page edits and
+[[comment|comments]] postings can be checked for spam. Currently,
+detected spam is not saved for human review, it is just rejected.
+
+You can control how content is tested via the `blogspam_options`
+setting. By default, the options are configured in a way that is
+appropriate for wiki content. This includes turning off some of the
+more problimatic tests.
+
+The `blogspam_pagespec` setting is a [[ikiwiki/PageSpec]] that can be
+used to configure which pages are checked for spam. The default is to check
+all edits. If you only want to check [[comments]] (not wiki page edits),
+set it to "postcomment(*)".
+
+By default, the blogspam.net server is used to do the spam checking. To
+change this, the `blogspam_server` option can be set to the url for a
+different server implementing the same API. Note that content is sent
+unencrypted over the internet to the server, and the server sees
+the full text of the content.