Slightly improve database driver chack

Aleksander Machniak

2013-01-31 41db2bf47db6df8b6065986b7488f3fc538ebc14

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-- Updates from version 0.4.2 
 
DROP INDEX [IX_users_username] 
GO 
CREATE UNIQUE INDEX [IX_users_username] ON [dbo].[users]([username],[mail_host]) ON [PRIMARY] 
GO 
ALTER TABLE [dbo].[contacts] ALTER COLUMN [email] [varchar] (255) COLLATE Latin1_General_CI_AI NOT NULL 
GO