doc updates
rev update
is_commentable() had some major issues when applied to the atrocity known as ConversationObject, hopefully this won't destabilise the network as it's a somewhat major permission tweak related to comments; also add any local clones to allowed_public_recips() as they should always be allowed recipients. Not sure what to do about host permissions in the event of clones. They have more than one host, and it isn't spelled out in the sent message.

All of this stuff will make your head hurt.