core (memory/encryption): start improvments, stop and getSession: - "start" won't do anything if session is already encrypted with requested algorithm, and will raise a ConflictError if it's already encrypted but with an other algorithm - implemented "stop", with an optional namespace to check we are stopping the expected algorithm - "getSession" retrieve the current encryption session of a jid, if any

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

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