[pg] fix getting table information if search_path contains escaped schema name

Fixed the QueryBuilder::setMaxResults() signature to accept NULL

Fix unquoted stmt fragments backslash escaping

Fix docblock typos in DriverManager docs

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

Fix JOIN with no condition bug

also simplifies the code and now exactly matches postgresql search rules

Fix DebugStack#queries docblock type

Remove superfluous Configuration instance

A configuration instance is not strictly required by [DriverManager::getConnection](https://github.com/doctrine/dbal/blob/master/lib/Doctrine/DBAL/DriverManager.php#L139).

As an upside, it doesn't add an extra warning for people that use Psalm/PHPmd when starting off from the documentation example. As the Configuration class has an `@internal` block those tools threat it as the other meaning for `@internal`, as in class that is [internal to the library and not for public use](https://docs.phpdoc.org/references/phpdoc/tags/internal.html).

Fix breaks named parameters in Oracle

[GH-3777] Don't remove composer lock travis on stable 2.10 branch

Allow build failures for unstable dependencies

Switched from PHPBrew-based configuration to the Docker-based

As per the support response, continuousphp switched to building their containers based on the official images from PHP.

Remove temporary SQLite file on teardown

Update deprecation messages to refer to DBAL

Replace DefaultTypes with Types in type constant deprecation annotations

New deprecations for 2.10

add missing exit codes to ensure Symfony 5 compatibility