Remove the sub-directories for checks.
Change the supported PHP version in phpdoc.
Add description for process_execute_detached check.
Add memory_limit check.
Add Contao SMH check.
Improve the memory unlimited summary.
Add description for the Contao SMH check.
Add curl extension check.
Add allow_url_fopen check.
Rename the memory_limit check into php_memory_limit.
Add apc check.
Add suhosin check.
Add direct installation support.
Fix issue with selected checks.
Improve the memory limit check descriptions.