Added session token to guestbook and e-nmail forms.

new table:

CREATE TABLE `XXX_antispamtokens` (
  `token_id` char(32) NOT NULL DEFAULT '',
  `session_time` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',
  `browseragent` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
  PRIMARY KEY (`token_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;