Ability to batch upload new versions

[#1]

Right now, you have the ability to batch upload new proofs, but for new versions of an existing proof, you have to upload one by one. When ProofHQ was a standalone product, it had the ability to batch upload new versions. The software would recognize the name, up until a _v1, _v2, etc. and would determine that this was a new version rather than a new proof.

[#2]

We would benefit from this greatly as we deal with single page pdfs for catalogues that run into a thousand + pages