Update ADOdb to 5.19 release + oci8 / pgsql bug fixes

This covers the following

* update of ADOdb library submodule to v5.19 (we were using a development release until now)
* Fix for regression issue introduced by ADOdb 5.19 (in fact caused by us not defaulting a db_query_bound() parameter to the same value as the underlying ADOdb function)
* Fix regression in logging API introduced by 2d0df25ec0fc7d9a0d97c8e5e102b617e5ff96d9
* Permanent fix for http://www.mantisbt.org/bugs/view.php?id=15426 (revert the implemented workaround)
* Fix ORA-01400 error http://www.mantisbt.org/bugs/view.php?id=17333
* Preventive fix for pgsql to avoid issues with int/bool conversions