+ /**
+ * Register a new user account and profile and set up default subscriptions.
+ * If a new-user welcome message is configured, this will be sent.
+ *
+ * @param array $fields associative array of optional properties
+ * string 'bio'
+ * string 'email'
+ * bool 'email_confirmed' pass true to mark email as pre-confirmed
+ * string 'fullname'
+ * string 'homepage'
+ * string 'location' informal string description of geolocation
+ * float 'lat' decimal latitude for geolocation
+ * float 'lon' decimal longitude for geolocation
+ * int 'location_id' geoname identifier
+ * int 'location_ns' geoname namespace to interpret location_id
+ * string 'nickname' REQUIRED
+ * string 'password' (may be missing for eg OpenID registrations)
+ * string 'code' invite code
+ * ?string 'uri' permalink to notice; defaults to local notice URL
+ * @return mixed User object or false on failure
+ */