Removed header flush as a fix for metadata population in head

In view2.php 'meta_head' containing all the citation metadata information is assigned to the view template, however at this point the header.tpl.html file is already flushed so the data is never shown.

To show the data, we can include the header.tpl.html file in view.tpl.html and remove the flush.

On my setup at least using chrome this seems to improve page load speed. Need to have a little more of a look to see why that is though.