Revert "Removing D6 modules for good."

This reverts commit 4cf7c277d80f54f1a314daea34ebe9eefaa0e062.
Revert "Revert "Removing D6 modules for good.""

This reverts commit 50f6433a1d1841b889ee0896f5f1c6bb2dd25012.
Increasing memory limit in .htaccess file
Adding node reference and entity reference modules