Backwards compatibility is maintained already in core.info by supplying the same information in the same format as the old core.info calls. The only added information is a `characters` key, with an array of characters. I've backed out (as of paxswill@447286a8b324f602dbb60ee8e46848e74e8eae45) the `tags` key be a union of all of the characters' tags, and it is now limited to the same character as the rest of the old keys. Tag information for all characters (filtered by grant) is now available from the mappings in the `characters` array.