core (xmpp): adapt message workflow to components: message workflow were not used for components so far. This patch activate it, normalise namespace to the client one to simplify parsing, and use SatXMPPComponent.sendHistory and SatXMPPComponent.receiveHistory to indicate if a component should store sent and received message in database (they both default to False). OTR plugin is deactivated for components. rel 367

You'll find install instructions in documentation (see doc/installation.rst).

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