New user field called "emailstop" ... to stop emails.

I had to do it ... this is driving me nuts with some people
on moodle.org

lib/db/postgres7.php

@@ -444,6 +444,10 @@ function main_upgrade($oldversion=0) {
         }
     }
 
+    if ($oldversion < 2004022000) {
+        table_column("user", "", "emailstop", "integer", "1", "unsigned", "0", "not null", "email");
+    }
+
     return $result;
 
 }