Add the long awaited 'maintainer notification' system. This system, running from the cron

cleanup scripts, will look for maintainers that have queued entries that the maintainer can
process. If the queued entries aren't processed for X days an email is sent. In X*2 days
another email is sent. After X*3 days the maintainer is stripped of their maintainership as
they aren't really maintaining the application anyway. The hope is that this system lets
maintainers know that they have pending queued entries to process to reduce the pressure on the
appdb admins to handled hundreds of queued entries.

tables/maintainers.sql

@@ -12,13 +12,15 @@ drop table if exists appMaintainers;
  * for both queued and unqueued maintainers
  */
 create table appMaintainers (
-    maintainerId    int not null auto_increment,
-    appId           int,
-    versionId       int,
-    userId          int,
-    maintainReason  text,
-    superMaintainer bool,
-    submitTime      datetime,
-    queued          enum('true','false','rejected') NOT NULL default 'false',
+    maintainerId        int not null auto_increment,
+    appId               int,
+    versionId           int,
+    userId              int,
+    maintainReason      text,
+    superMaintainer     bool,
+    submitTime          datetime,
+    queued              enum('true','false','rejected') NOT NULL default 'false',
+    notificationLevel   int not null default '0',
+    notificationTime    datetime,
     key(maintainerId)
 );