Added: RSS post feed nick name. Update of last_read_id
Added: origin_link, author RSS-related fields
Fixed: various errors with RSS post author field.
Added: "read more" link to chat/rss messages.
Various touchups for drawing RSS posts in chat
Fixed: double escaping.
Fixed: links open in _blank window when in chat.
Fixed: path typo.
Fixed: empty string was being treated as false.