[DBAL-918] Correcting the doc because mysqli doesn't support named parameter natively

Added flags support for mysqli::real_connect in Mysqli driver.

Merge pull request #595 from JeroenDeDauw/testGivenForeignKeyWithZeroLength_acceptForeignKeyThrowsException

Add testGivenForeignKeyWithZeroLength_acceptForeignKeyThrowsException

Some much needed cleanup in the TestUtil class

Prevent Connection from maintaining a second reference to an injected PDO object.

Prevent Connection from maintaining a second reference to an injected PDO object. Previously, if a developer explicitly closed the Connection, only the _conn reference was destroyed, but the _params['pdo'] reference remained and kept the PDO connection alive. By unsetting the _params reference, we maintain only the _conn reference, exactly as if the PDO connection is generated internally.

Correct SQL Anywhere driver default port to 2638

References:
SQLA16 - http://dcx.sybase.com/index.html#sa160/en/dbadmin/serverport-network-conparm.html
SQLA12 - http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.sqlanywhere.11.0.1/dbadmin_en11/serverport-network-conparm.html

Update security.rst

Update security.rst

Fix: property access is not allowed yet

Fixes the warning emitted by mysqli when sqlstate is not set (yet?).
http://git.php.net/?p=php-src.git;a=blob;f=ext/mysqli/mysqli_prop.c;h=2d36336372b75922bd8fbf40c5c9054a5230c8a0;hb=HEAD#l36

Warning masks actual connection error.

[DBAL-474] Fix filtering sequence names on PostgreSQL

Fix DateTimeTz type compatibility on SQL Anywhere versions < 12

Fix FOR UPDATE SQL on SQL Anywhere

[DBAL-801] Add date arithmetic interval methods for seconds, minutes, weeks, quarters and years

Close #598

Adding doctrine-dbal to composer.json and making it work just like doctrine command (from Doctrine ORM)

Remove @param tags that add no value

Add missing imports

Remove type hint template clutter

Minor cleanup in SchemaManagerFunctionalTestCase