added some new options for comments.
this is still only the account level (can't yet have different settings for a particular gallery)
now instead of the Comments or Not
there are four choices.
-Anybody can post comments including guests.
-Must be logged in to PBase to comment.
-Must be a PBase subscriber. (paid, not a trial account)
-Nobody can post.
This can be set on the "account settings" page. http://www.pbase.com/account
-slug