core (memory/sqlite): added stanza_id: /!\ database schema change /!\ stanza_id is a new field in history added to prepare the implementation of MAM for messages. A new "last_stanza_id" can be used in filters to retrieve last message with a know stanza id (useful for history synchronisation).

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

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