Revert "Merging .cov files ignores their filter settings"
Revert "Merging .cov files ignores their filter settings"

This reverts commit f0323491157e197faf5e3499670e216ddb066438.

dnalini/PHP-CODE-Coverage,Koc/php-code-coverage,theseer/php-code-coverage,bwoebi/php-code-coverage,theseer/php-code-coverage,sebastianbergmann/php-code-coverage,sebastianbergmann/php-code-coverage,sebastianbergmann/php-code-coverage,kelunik/php-code-coverage,theseer/php-code-coverage,iFixit/php-code-coverage