Revert "fix header"

This reverts commit 42853fd91a7abdde143809c269984cdb691c992a.
Revert "Remove <base> tag completely"

This reverts commit f6d5200c75c51ae9eafda4fc93e5cb24e87f205e.
Revert "BASE_HREF's host part differs from HTTP_HOST (www prepended) causing issues in Opera 12"

This reverts commit 7ab7b50ac40b4f17b8a9ed392ac0bcf2f94621ee.