[development] Microsoft SQL Support added

Hi everybody, I've done a quick hack to support MS-SQL-Server, since my company needed that functionality. I know, that MS-SQL was supported in earlier versions and that you decided to drop it. Since only minor changes to the system were necessary I believe that supporting this database would not take so much. I've done that for version 4.7.2, you can get the patch here: http://www.heinrichp.de/drupal-4.7.2-mssql.patch This is not tested very much but it works for me quite fine. Tested with: Database System: Microsoft Server 2003 Standard Microsoft SQL Server 2005 Webserver: Debian Sarge PHP-Sybase driver regards, Peter