Markup update to valid formats and fix to include updated download links on version change from dropdown.

filever.php - added w3c complaint script tag markup.

functions.php - added valid script tag markup, valid link tag markup for
stylesheets , added consistent design class as per the modal in
integration text area.

integrationver.php - added same markup improvements like functions.

suggest.php - added javascript to upload download link as per the
version change from the dropdown.

filedownload.php - included for updating the download link.