Switch to side-by-side view

--- a/Allura/allura/migrations.py
+++ b/Allura/allura/migrations.py
@@ -19,7 +19,7 @@
 
     def up(self):
         if self.session.db.name == 'allura':
-            self.ormsession.delete(
+            self.ormsession.remove(
                 M.Mailbox,
                 {'type':'flash'})