Default simple view template to display a single comment.
Rather than doing anything with this particular template, it is more
efficient to use a variant of the comment.tpl.php based upon the view,
which will be named comment-view-VIEWNAME.tpl.php. This isn't actually
a views template, which is why it's not used here, but is a template
'suggestion' given to the comment template, and is used exactly
the same as any other variant of the comment template file, such as