Add description to IncidentStatus

Adds a new column to the IncidentStatus to permit the user to explain
why the status change was made. Also exported this and Incident data
into the demo sql file.

build/schema/mysql.sql

@@ -117,6 +117,7 @@ CREATE TABLE IF NOT EXISTS `incidentstatus` (
   `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
   `incident` int(10) unsigned NOT NULL,
   `status` int(10) unsigned NOT NULL,
+  `description` text NOT NULL,
   `ctime` int(10) unsigned NOT NULL,
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB  DEFAULT CHARSET=utf8 ;