quick frontend(chat): prepared factorisation of merging of user moved info messages: - new MessageWidget class, to have a common ancestor for widgets from different frontends - new message_widgets_rev property to get reverse iterator on message widgets - new isUserMoved method to check if a Message is a user moved info - new handleUserMoved method to merge info message when suitable. This is code from Primitivus made generic.

You'll find install instructions on the following link: http://wiki.goffi.org/wiki/Salut_%C3%A0_Toi

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