Move comment_form do_action() above submit button

[MC_incubus]

The comment_form hook is awesome... but its default position (below the submit button) is limiting. The hook is useful for adding checkboxes like "subscribe to comments" and the like, but those checkboxes don't make as much sense below the submit button as they would make above.

I think a much better location for the comment_form do_action() would be right between the comment box and the submit button.

[filosofo]

I agree that having the action hook earlier would have been a better choice, but at this point moving it would create backwards-compatibility problems.