Fix Bug 21401: Comments field on "Review Patch" page should be initially filled with quoted patch

        <https://bugs.webkit.org/show_bug.cgi?id=21401>

        Reviewed by Dave Hyatt.

        * attachment.cgi:
        (edit): Retrieve the attachment data from the database instead of just
        its length. When the attachment is a patch, create a quotedpatch
        template variable that contains the patch data with each line
        prepended with "> ".
        * template/en/custom/attachment/reviewform.html.tmpl:
          - Changed the comments field to have a monospace font
          - Added an "Enter comments below:" caption above the comments field
            to make it clearer that this is where comments should go, now that
            the comments field is not initially empty
          - Fill the comments field with the quoted patch

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@37813 268f45cc-cd09-0410-ab3c-d52691b4dbfc