Merge branch '8-10-multi-store' into 'master'
8 10 search publications in several stores * The origin field is now a string containing the list of oai_url separated by a comma, one value for each store. * Additional method to the class `Record`: `primary_oai`, `primary_oai_url`, `secondary_oai`, `secondary_oai_url`. * Change the signature of the methods: `Automaton._is_record_in_db`, `Automaton.get_record_by_fields` and `Articles.get_record_by_origin`. * Harvester logic modified to search articles in several stores. * Close #8, #10 See merge request !31
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