Files: Ability to Replace a File Instead of Deleting

[eaquigley]

For the Provenance project, we need to determine how a user can replace a file instead of deleting the file and uploading a new one.

This relates to the backend structure (@scolapasta and @landreev) and what it looks like in the UI (@eaquigley and @mheppler)

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• Make sure group check is activated before pull request!!