Add transaction support

Use binary safe function for quoting

Fixed memory leak.

Update for placeholder flags

Kill unused var.

Fix build on win32

Fixed parameter order.

Added getAttribute() handler.
Fixed leak inside exec().

Use native PostgreSQL connect string e.g.
$db = new PDO("pgsql:dbname=template1 user=postgres password=secret");

We quote with ' in real databases

Make sure that the error string is freed.

Last insert id (oids) support.

Make doer() work.
Make error reporting system work.

Fix prototype.
Use user-supplied path before the default when looking for headers

PostgreSQL PDO driver.