Merge pull request #155 from oohlaf/fixes

Explain why public comments are disabled and what needs to happen to enable them.

include/items.php

@@ -98,6 +98,10 @@ function can_comment_on_post($observer_xchan,$item) {
 				return true;
 			break;
 		case 'public':
+			# We don't allow public comments yet, until a policy 
+			# for dealing with anonymous comments is in place with 
+			# a means to moderate comments. Until that time, return 
+			# false.
 			return false;
 			break;
 		case 'contacts':
@@ -3874,4 +3878,4 @@ function items_fetch($arr,$channel = null,$observer_hash = null,$client_mode = C
     }
 
 	return $items;
-}
+}