TEXT/BYTE support with FTM/ESM database drivers

Fix of bug #23103 changes the behavior of FTM and ESM database drivers.

In version 2.50, the fix for bug #23103 changes the behavior of FTM and ESM database drivers regarding TEXT and BYTE Informix^® types in DDL statements such as CREATE TABLE or ALTER TABLE.

The TEXT and BYTE data types were previously converted to TEXT and IMAGE data types, respectively, in SQL Server.

The TEXT and BYTE data types are now converted to VARCHAR(MAX) and VARBINARY(MAX) data types, the recommended LOB types introduced in SQL Server 2005. It is still possible to use SQL Server TEXT and IMAGE types, but if you create or alter tables in an FGL program, the VARCHAR(MAX) and VARBINARY(MAX) types will be used instead.