Give the new user tables the once-over. Strip the current set of methods

from IUserAccountService, we need to define what goes in there. Change
the handler to the generic handler. Adjust migrations, add index

OpenSim/Data/MySQL/Resources/002_UserAccount.sql

@@ -0,0 +1,5 @@
+BEGIN;
+
+INSERT INTO UserAccounts (UserID, ScopeID, FirstName, LastName, Email, ServiceURLs, Created) SELECT `UUID` AS PrincipalID, '00000000-0000-0000-0000-000000000000' AS ScopeID, username AS FirstName, lastname AS LastName, email as Email, CONCAT('AssetServerURI=', userAssetURI, ' InventoryServerURI=', userInventoryURI, ' GatewayURI= HomeURI=') AS ServiceURLs, created as Created FROM users;
+
+COMMIT;