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Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Handle the synchronisation on metadata

If new metadata is available when the viewer requests an index, we set
the new_metadata flag in the index packet. If it requests a data packet
and new metadata is available we inform it to update its metadata first.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>