Class MucRoomUser

Describes a user of a MUC room.

The attributes of this object should not be changed directly.

:Ivariables:
    - `presence`: last presence stanza received for the user.
    - `role`: user's role.
    - `affiliation`: user's affiliation.
    - `room_jid`: user's room jid.
    - `real_jid`: user's real jid or None if not available.
    - `nick`: user's nick (resource part of `room_jid`)
:Types:
    - `presence`: `MucPresence`
    - `role`: `str`
    - `affiliation`: `str`
    - `room_jid`: `JID`
    - `real_jid`: `JID`
    - `nick`: `unicode`

Initialize a `MucRoomUser` object.

:Parameters:
    - `presence_or_user_or_jid`: a MUC presence stanza with user
      information, a user object to copy or a room JID of a user.
:Types:
    - `presence_or_user_or_jid`: `MucPresence` or `MucRoomUser` or
      `JID`

When `presence_or_user_or_jid` is a JID user's
role and affiliation are set to "none".

Check if two `MucRoomUser` objects describe the same user in the
same room.

:Parameters:
    - `other`: the user object to compare `self` with.
:Types:
    - `other`: `MucRoomUser`

:return: `True` if the two object describe the same user.
:returntype: `bool`

Update user information.

:Parameters:
    - `presence`: a presence stanza with user information update.
:Types:
    - `presence`: `MucPresence`