Enhancement: Enable and configure `concat_space` fixer

Closes GH-657.

Fixed bug#43876 (http://us2.php.net/phpnetimprovedsearch.src throws parse error)

Fixed bug#42031 php.net website problem (patch by Marco Rodrigues <Marco at clustercube.com>)

Add 'opensearch' by Marco Rodrigues
(Supports Firefox2 and IE7..)