Extract and use original file format

[bryanmgee]

Dataverse's configuration to convert a variety of tabular formats to TSV will muddle aggregate reporting, there are fields to retrieve the original MIME and friendly formats.

"originalFileFormat": "text/comma-separated-values",
"originalFormatLabel": "Comma Separated Values",

[bryanmgee]

Should extract original file size too and do a comparison, not sure how big the difference is really.