Item12349: Item12410: Item12629: Item12634: AntiWikiSpamPlugin

Add configuration to support batch signature downloads
Disable attachment checking by default
Bug fixes - make sure extension works without the global regex list.

git-svn-id: http://svn.foswiki.org/trunk@17583 0b4bb1d4-4e5a-0410-9cc4-b2b747904278