Only show the 'add entry' link if the class has enabled it. The link is only useful for classes

that have no parent objects. The objectShowAddEntry() method is not required because it only
affects the user interface.

include/distribution.php

@@ -669,6 +669,11 @@ class distribution {
     {
         return FALSE;
     }
+
+    function objectShowAddEntry()
+    {
+        return TRUE;
+    }
 }
 
 ?>