Desupported database drivers

Database drivers for old database client versions are removed according to the vendor de-support plans.

Database drivers desupported in versions 2.50:

SQL Server MDAC drivers (Code MSV, name: dbmmsv*):
On a Microsoft™ Windows™ platform, use the SQL Server Native Client driver instead (Code SNC).

With the SNC drivers, set the dbi.database.dbname.snc.widechar FGLPROFILE entry to false when using CHAR/VARCHAR/TEXT in the SQL Server database.
Oracle MySQL 5.4 (dbmmys54x)
Oracle Database 8.1 (dbmora81x)
Oracle Database 9.0 (dbmora90x)