Adding support for datetimeoffset for MSSQL Server 2008

Fix: fix an error because of which instead of loading \Symfony\Component...

Adding PDO::FETCH_COLUMN support to OCI8 fetchAll method using the fetch structure OCI_FETCHSTATEMENT_BY_COLUMN.

missing call to logger in Connection->exec(), cleanups

Allow empty host to PDOOracle

SQLParserUtils triggered an error when feeding it Type instances instead of PDO param type ints

Log transaction statements

[DBAL-237] Fix bug when removing and adding an index on the same columns that may be part of a foreign key.

DDC-451 - GUID support through a specific GUID Type, SQL Server specific implementation all others fallback to Varchar fields, no automatic default value = new guid support yet.

Removed is_int check and converted both comparisons into equality comparisons when expanding list parameters.

[DBAL-220] Add support for Index flags and implement support for SQL Server CLUSTERED/NONCLUSTERED and MySQL FULLTEXT.