Clean up layout of index template code
Specify every parameter in wp_list_comments call
Get “require commenter name and email” option before trying to use it
Don’t check for comments_open in the respond form, as we’ll do that
before we call it
A more natural caption for required and not published email field
Size the avatar at 64px (4em at default font size)
Check comments are open and that registration isn't required before displaying respond form