Rename files after upload

[IMS212]

This is a pretty simple request; the ability to rename a file after an upload.

There are some workarounds that seem like they may work but do not:

• Replacing the file with an identical file with a different name. This just does nothing, probably because the hashes match.
• Replacing the file with a dummy file, then replacing it with the new file: everything dies and/or nothing happens, unknown why.