fix get face url changed

Signed-off-by: xiehuc <xiehuc@gmail.com>
auto create group when not found from message

当别人新创建一个讨论组时, 收到消息后找不到该组, 自动创建, 并显示消息
(类似于陌生人的处理流程)

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix crash when add passerby group

创建一个group的时候需要同时指定gid和code才能使用.

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix python bindings a entry

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix change discu member failed

Signed-off-by: xiehuc <xiehuc@gmail.com>
update comment

Signed-off-by: xiehuc <xiehuc@gmail.com>