Offer reference info with Infobox data for Wikidata import

[siznax]

Perhaps, if we add the <ext>, <ref>, etc. tags that we drop when extracting Infobox data to another data member (with the same keys), say "page.data['infobox_refs']", then that might help developers use this tool to put that data into Wikidata by helping to satisfy the "Add only verifiable information" requirement.

Comments, suggestions?