Merge branch 'master' of https://github.com/gradator/roundcubemail into gradator-master

SQL/mssql/2016100900.sql

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+ALTER TABLE [dbo].[session] ALTER COLUMN [ip] [varchar] (40) COLLATE Latin1_General_CI_AI NOT NULL
+GO

SQL/mysql/2016100900.sql

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+ALTER TABLE `session` MODIFY `ip` varchar(40) NOT NULL;

SQL/oracle/2016100900.sql

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+ALTER TABLE session MODIFY ip varchar(41) NOT NULL;

SQL/postgres/2016100900.sql

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+ALTER TABLE session ALTER COLUMN ip TYPE character varying(41);