Apparently, the form_spam_protect plugin only works with HTTP POST, not GET. Unsafe operations (save and file-upload) should be POSTs anyway. Fixed. Also, two broken tests fixed. Only two Unit Tests now fail: both are minor bugs in XHTMLDiff.
Got rid of redcloth_for_tex. Fixed almost all the busted tests.
Sync with Revision 519 of Instiki trunk (2007/5/7).