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.

source/lib/StatusBoard/IncidentStatus.class.php

@@ -7,6 +7,7 @@ class StatusBoard_IncidentStatus extends StatusBoard_DatabaseObject {
     protected $_db_id;
     protected $_db_incident;
     protected $_db_status;
+    protected $_db_description;
     protected $_db_ctime;
         
     protected function all_for_incident(StatusBoard_Incident $incident) {