Add support for the View header/footer text to export feeds

I don't mean the individual header values for column headers. I am referring to the page header.

I have a requirement for a csv file where the first line is some metadata - I thought I could pop it into the header field for the view and have it display before the rows and their headers, but this doesn't seem to be the case.

Since it's _also_ not possible to override the theme, for which see:

http://drupal.org/node/552652
and
http://drupal.org/node/546542

It's a little bit of a problem, at least for me! : )