Added HTTP header support for charset encoding (relates to utf-8).

The [config][metaCharset] information is no used for the HTTP header information. It's still possible to override this default by defining a addtionalHeaders entry.

See thread at the dev-list archive:
http://typo3.org/1427+M5518a97ebce.0.html


git-svn-id: https://svn.typo3.org/TYPO3v4/Core/trunk@28 709f56b5-9817-0410-a4d7-c38de5d9e867