Fix operator incompat. in some queries on contacts table using MS SQL Server (#1488505)

SQL/mssql.initial.sql

@@ -40,7 +40,7 @@ CREATE TABLE [dbo].[contacts] (
 	[changed] [datetime] NOT NULL ,
 	[del] [char] (1) COLLATE Latin1_General_CI_AI NOT NULL ,
 	[name] [varchar] (128) COLLATE Latin1_General_CI_AI NOT NULL ,
-	[email] [text] COLLATE Latin1_General_CI_AI NOT NULL ,
+	[email] [varchar] (8000) COLLATE Latin1_General_CI_AI NOT NULL ,
 	[firstname] [varchar] (128) COLLATE Latin1_General_CI_AI NOT NULL ,
 	[surname] [varchar] (128) COLLATE Latin1_General_CI_AI NOT NULL ,
 	[vcard] [text] COLLATE Latin1_General_CI_AI NULL ,

SQL/mssql.upgrade.sql

@@ -249,3 +249,12 @@ GO
 ALTER TABLE [dbo].[contacts] ALTER COLUMN [email] [text] COLLATE Latin1_General_CI_AI NOT NULL
 GO
 
+-- Updates from version 0.8-rc
+
+ALTER TABLE [dbo].[contacts] DROP CONSTRAINT [DF_contacts_email]
+GO
+ALTER TABLE [dbo].[contacts] ALTER COLUMN [email] [varchar] (8000) COLLATE Latin1_General_CI_AI NOT NULL
+GO
+ALTER TABLE [dbo].[contacts] ADD CONSTRAINT [DF_contacts_email] DEFAULT ('') FOR [email]
+GO
+