Gets the IsConfigured check checking the migration data, updates the install controller to ensure there's no infinite redirects and to use the IsUpgrading flag. Now to add entries to the table when the migrations have executed.

src/Umbraco.Core/Configuration/GlobalSettings.cs

@@ -242,6 +242,7 @@ namespace Umbraco.Core.Configuration
             }
         }
 
+        //TODO: Move these to constants!
         public const string UmbracoConnectionName = "umbracoDbDSN";
         public const string UmbracoMigrationName = "Umbraco";